List of "about:config" commands

I want to be able to really fine tune/customize firefox, but many of the changes I want to make are only available thru "about:config". An example of such a change -- how to force new tabs to open blank -- took quite a bit of searching and knowing what question to ask or how to phrase it. Is there a list of all the "about:config" commands, and if so, where do I find/get them? Is it just a printable list (acceptable, but just...), a basic searchable database (better, but probably still have to know/phrase a question), or best yet, a keyword searchable db with both of the previous options? Also, is this putative list version specific, or is it constantly updated with a mix of old and new commands? I realize the risk of severely damaging the firefox installation, and am prepared to take it, as I think I'm reasonably cautious, and would check out any truly questionable changes before making them.

hello eviltwin, here is a site which covers many preferences from about:config (however it's neither complete nor always up-to-date): http://kb.mozillazine.org/About:config_entries
mozilla's own documentation in this regard is rather limited currently: https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference

Similar Messages

Is there an about:config command I can create for Firefox Mobile to remove the list of "Top sites?"

So it would seem that there is no add-on or feature to wipe or hide the "Top sites" list from Firefox mobile.
If there is no built in method of removing this information, could I make an entry in the about:config of the mobile platform to remove this information? I am satisfied if it is simply hidden, but would prefer if I could delete this information all together.
Any help in constructing this script would be greatly appreciated.

There is no way to change the about:home page at this time. It is something we are looking into but it will be a while before it is part of Firefox.

Need to disable the clearing of browsing history and what is the "about:config" function for it?

I am working on an Group Policy Administrative template for Wetdog.exe, and it's awesome by the way. Just want to know what function to use (listed in "about:config" url) so i can turn this feature off entirely.
I don't want my users deleting browsing history, or have any ability to view it either.
Still, i want the browser to keep at least 30 days of history.
This is EASILY accomplished in Internet Explorer via GPO, but not so much in Mozilla with wetdog.exe and it's admin templates. I am using Windows Server 2003 enterprise edition R2 on 2 domain controllers, and Windows XP Professional SP3 client workstations with Mozilla 3.6.3 and the latest version of Wetdog.exe and it's admin templates.
Any help would be much appreciated!!!
== This happened ==
Every time Firefox opened
== My boss decided that we need to keep browsing history locked out of our existing 700+ workstations ==
== Troubleshooting information ==
just need to disable the "history" button, the "tools\clear recent history" button, and "tools\options\privacy tab\history"

It can be annoying, but I think their motivation is good. They are trying to make things better for their customers and I think they have, even though sometimes it is annoying. I think it would be nice if they would advise us when the pages are going to be down for maintenance, In the mean time, you could have another E mail account so you can always get access to your E mail.

I want to change the file location for the automatic backup file bookmarks.file, but I can't find browser.bookmarks.file in the list on the about:config page.

I asked about automatic backup of bookmarks and received the following answer:You can make Firefox 3 create an automatic HTML backup (bookmarks.html) when you exit Firefox if you set the pref [http://kb.mozillazine.org/browser.bookmarks.autoExportHTML browser.bookmarks.autoExportHTML] to true on the about:config page. That backup is created by default in the profile folder as bookmarks.html, but you can set the file name and path via the pref [http://kb.mozillazine.org/browser.bookmarks.file browser.bookmarks.file] on the about:config page. I went to about:config page and toggled browser.bookmarks.autoExportHTML to “Yes” and it’s working. However, I want to change the file location, but I can’t find browser.bookmarks.file in the list.

The browser.bookmarks.file preference does not exist by default. Right-click in about:config and select "New > String" to create it.

Can't print because I have no "print.print_printer" entry in my about:config list?

I haven't been able to print anything from Firefox for about a month now. My printer works just fine, as I can print from Internet Explorer and Iron browsers without issue. This ONLY happens when I'm using the Firefox browser. Please do not refer me to the article about printer issues - I have already exhausted everything on that list, without resolve.
I still sometimes use my older computer (same OS - Windows 7 Home Premium) and I checked the about:config list to see what it has that my current computer does not. I found MANY entries for my Canon MX340 computer! Why doesn't my current computer have ANY of these? The printer works perfectly fine with the older computer and Firefox, so I am completely at a loss here. Any suggestions?

Firefox 6.0 and later use '''print_printer''' for the last used printer.
In Firefox 5.0 and earlier versions '''''print.print_printer''''' was that preference name.
As explained here - https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox#w_reset-firefox-printer-setting
My recommendation is to '''reset all Firefox printer settings''' as explained on that support page..

Why is there no "xpinstall.enabled" listing in my Firefox "about.config"

I am having a problem installing an add-on for Firefox on my XP desktop: When I attempt to install Evernote Web Clipper 5.9.1, I get the error: "There was an error installing Evernote Web Clipper - Try Again".
I investigated on the Firefox Help site and found an instruction (copied below) to look in the Firefox "about.config" file to see if the "xpinstall.enabled" listing was "true" or "false". Supposedly, if the listing is "false" it should be changed to "true" to permit installation of add-ons.
Software installation disabled
It is possible to disable all installation of software, including add-ons, through Firefox. To check to see if software installation has been disabled:
In the Location bar, type about:config and press Enter.
The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise! to continue to the about:config page.
In the Search textbox, enter xpinstall.enabled.
The value of xpinstall.enabled should be set to true. If this value is currently set to false, then software installation is disabled.
To set the value to true, right-click the property name, and select Reset.
Try to re-install the extension.
There is no "xpinstall.enabled" listing in my version of "about.config".
I have:
xpinstall.whitelist.add user set string
xpinstall.whitelist.add.180 user set string
xpinstall.whitelist.add.36 user set string
The spaces for "value" on all three listings are blank (empty)
What to do?

In some cases, when a preference is set to its default value, it is not displayed in about:config.
What method of installation are you using?
* Add to Firefox button here: https://addons.mozilla.org/en-US/firefox/addon/evernote-web-clipper/
* Downloaded that file, then dragged it to an open Firefox tab
* Trying to install from another website

CAN'T GET ADD ONS. XPINSTALL.ENABLED DOES NOT SHOW UP IN ABOUT:CONFIG LIST.

ADD ON S TAB SHOWS LOADING, BUT NEVER SHOWS A LIST OF ADD ON S. LOOKED FOR "XPINSTALL.ENABLED" IN "ABOUT:CONFIG" SO I COULD CHANGE IT, BUT IT IS NOT THERE.

If the Get Extensions tab in about:addons isn't working then you can go to the Add-ons website and search for extensions yourself.
*https://addons.mozilla.org/firefox/
The xpinstall.enabled pref default to true when absent and doesn't have any real effect in preventing to obtain and install extensions unless locked to false.
*http://kb.mozillazine.org/Installing_extensions
*http://kb.mozillazine.org/Obtaining_extensions

How can I rectify a wrong command in about:config in Mozilla Firefox

Pls help me to solve below problem:
In a certain blog ( http://techtips01.blogspot.com/2010_03_17_archive.html ) dated 17 March, 2010 I found in point no. 07:
7. Rather than wait until a page has completely downloaded to display it to the user, Mozilla applications will regularly render what has been received to that point. This option controls the maximum amount of time the application will be unresponsive while rendering pages.
Right-click (Apple users ctrl-click) anywhere in the about:config window, select New and then Integer from the pop-up menu.
A. Enter content.max.tokenizing.time in the New integer value pop-up window and click OK
B. You will be prompted to enter a value. Enter 2250000 and click OK.
But during mouse clicking I made a mistake instead of clicking “integer” I did click on “string” (New --> String).
As a result it becomes:
Preference Name
Status
Type
Value
content.max.tokenizing.time
User Set
String
2250000
Which should be:
Preference Name
Status
Type
Value
content.max.tokenizing.time
User Set
Integer
2250000
I tried a lot to set “integer” instead of “string” but I am fail to do that. I would like to know if there is any problem for that !!!!
Pls help me to set “integer” in “type” column. I will be grateful to you if you pls give me solution for the above mentioned problem. Waiting for your kind & prompt reply.
Thanks & Best Regards,
S. M. Anowerul Kabir (Tutul)
Ph.: 88 - 01817 045 805
B-253 (C-3), Khilgaon Chowdhurypara,
Khilgaon, Dhaka-1219, Bangladesh.
Email: [email protected]
== This happened ==
Not sure how often

Your question was answered yesterday in the following thread. Please do not start a new thread for the same question. Always bookmark the thread so that you can find it later or enter your e-mail address in the space provided so that you will receive a notification with a link back to the thread when someone has replied.
Your question (and answer) yesterday: https://support.mozilla.com/tiki-view_forum_thread.php?comments_parentId=711091&forumId=1

Tried about:config does not owrk now NEWTAB facebook/twitter etc.list is my startpage and comes up with every tab PLEASE how do I disable this awful newtab

I want to get rid of the newtab as my start page (homepage selected in options, but does not pan out)
and it comes up with every link. I tried about :config/ about:newtab to about:blank. now it is WORSE because it is now the homepage too.

Go to about:config, and search for 'newtab'. On 'browser.newtab.url', set the value to about:newtab. This is the default value.
If this doesn't work, try resetting Firefox. All of your data will be saved, and Firefox will be reset to the defaults. [[Reset Firefox – easily fix most problems]]

When I type about:config, a list shows up how do I delete an item from that list?

How do I delete items that come up when on the address line I type About:config

You can reset a pref to the default value via the right-click context menu.<br />
Then that pref will be removed if you close and restart Firefox in case that pref doesn't exist by default (i.e. type is string and shows nothing in the value field after the reset).<br />
Prefs that have a default or a user set value can't be removed.
*http://kb.mozillazine.org/about:config
*Use the Search bar at the top of the about:config page to locate preferences more easily
**Preferences that have been modified and do not have the default value show as bold (user set)
*Preferences can be reset to the default via the right-click context menu if they are user set
*Preferences can be changed via the right-click context menu: Modify (String or Integer) or Toggle (Boolean) or by double-clicking the line with the pref
*Preferences can be created via the right-click context menu: New -> String, Integer, Boolean

Missing "config" command in CLI (Cisco 1140 AP)

Hi All
I am trying to chang IP configuraton for my Cisco 1140 AP, but in CLI I dont have a "config" command (i used en before to enable administrative mode)
Bellow are the commands I can see:
AP7081.0506.d54a#?
Exec commands:
cd               Change current directory
clear            Reset functions
clock            Manage the system clock
crypto           Encryption related commands.
debug            Debugging functions (see also 'undebug')
delete           Delete a file
dir              List files on a filesystem
disable          Turn off privileged commands
enable           Turn on privileged commands
exit             Exit from the EXEC
fsck             Fsck a filesystem
help             Description of the interactive help system
led              LED functions
lock             Lock the terminal
login            Log in as a particular user
logout           Exit from the EXEC
lwapp            lwapp exec commands
mkdir            Create new directory
monitor          Monitoring different system events
more             Display the contents of a file
name-connection Name an existing network connection
no               Disable debugging functions
ping             Send echo messages
pwd              Display current working directory
release          Release a resource
reload           Halt and perform a cold restart
rename           Rename a file
renew            Renew a resource
rmdir            Remove existing directory
send             Send a message to other tty lines
set              Set system parameter (not config)
show             Show running system information
systat           Display information about terminal lines
terminal         Set terminal line parameters
test             Test subsystems, memory, and interfaces
traceroute       Trace route to destination
undebug          Disable debugging functions (see also 'debug')
upgrade          Upgrade software
verify           Verify a file
where            List active connections
In addition, I am keep getting the following messages:
*Mar 1 00:38:13.933: %CAPWAP-3-ERRORLOG: Not sending discovery request AP does not have an Ip !!
*Mar 1 00:38:23.883: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0, changed state to up
I am not sure what I am doing wrong. I try to do a hard reset but it didnt work.
Any ideas?

Thanks
Another queastion:
I verified that my AP is Lightweight by the part id (AIR-LAP1141N)
Now, when I browse to Cisco download page, I have 3 options for OS:
- Autonomous AP IOS Software
- IOS Boot Images
- IOS Software
- Lightweight AP IOS Software
Which of the above should I use in order to switch the AP to regular mode?
Does anyone knows what is the difference between IOS software and the Autonomous IOS software?

When opening new tab, how to make me able to type in the adress bar directly without clicking on it? -- (about:config reset and add-on doesn't work)

Hi all,
Need a help relating New Tab on Mozilla.
I want to be able to directly type in the address bar everytime I open a new tab in Mozilla, without clicking anything. To be clearer, it means that everytime I open the new tab, the blinking cursor is already on the address bar.
What's happening right now is everytime I open new tab, the cursor is not placed anywhere--not on the search bar on the page, not on the address bar. I should put the cursor somewhere to do something.
I tried using the about:config reset (1) and installing custom new tab (2), but both do not work.
When I tried the about:config reset the Reset button is not highlighted (I assume it means it's default already), and the Custom New Tab doesn't yield in different result.
What confuse me is 2 days ago my Mozilla works just fine. Everytime I opened a new tab, the blinking cursor was on the address bar and I was able to type directly.
Thank you and appreciate the help!!
Note:
(1) about:config reset:
- Type about:config into the address bar and press Enter.
- To bypass the warning, press the big button labeled "I'll be careful, I promise!".
- In the search box, paste browser.newtab.url
- In the search results, right-click browser.newtab.url and choose Reset.
(2) Custom Add On reset:
- Install Custom New Tab. = https://addons.mozilla.org/firefox/addon/custom-new-tab/
- Open the Add-ons Manager (Ctrl+Shift+A; Mac: Command+Shift+A), then the Extensions category.
- Next to Custom New Tab, click the Options button.
- Set whatever page you want to open in each new tab (about:newtab is the default; about:home is the default home page), and make sure "Place focus in URL bar" is not checked.

''philipp [[#answer-669209|said]]''
<blockquote>
ok, as a follow up i'd recommend disabling half of the addons & restarting the browser - if the problem continues disable the other half & continue until you've narrowed it down to the culprit...
</blockquote>
Hi Philipp,
I read the link you copied on the first post and also tried your recommendation above. None seem to work. Even if I disable all add-ons, the problem still persists.
One other info, this problem seem to appear after I installed several program yesterday. These programs apparently installed other programs that set my homepage and main search engine to a particular website. But I installed all of these programs already. Would that be a cause of the problem?
Thanks.

When closing Firefox windows, I would like a warning before the last window closes. The about:config settings do nothing. There is a warning for multiple tabs..

When closing Firefox windows, I would like a warning before the last window closes. The about:config settings do nothing. There is a warning for multiple tabs... why not for the last window? I do not use tabs... just windows... I have a mouse button programmed for that. It is really irritating to have to restart Firefox all the time and then open the history window because no warning was issued!

This is ridiculous. I've had this problems for years now and I'm finally walking away from Firefox. I use my keyboards more than my mouse, and how many times does your finger slip and hit Command Q instead of W. How come FF can't reset something as trivial as this? So many people are having problems with this?
Feels like FF has become too big, too slow and just not cooperative anymore. What a shame, I've been using Netscape/Firefox for 13 years. This is silly.

Is turning off iFrames via about:config browser.frames.enabled;false broken in Firefox 23?

I noticed that Firefox with version 23 removed option to turn OFF JavaScriipt from Tools > Options > Content menu
http://www.extremetech.com/computing/163291-firefox-23-finally-kills-the-blink-tag-removes-ability-to-turn-off-javascript-introduces-new-logo
Recent events when allegedly FBI used JavaScript in iframe to exploit bug in Firefox with intentions to uncover identity of users of TOR network encouraged me to play with security settings a bit.
More about how FBI exploited Firefox bug to execute malitious JavaScript on users computers: https://lists.torproject.org/pipermail/tor-announce/2013-August/000089.html More biased articles can be found in popular media articles. Just google "TOR exploit FBI"
ISSUE:
Symptoms:
I noticed that turning iFrames OFF in about:config > browser.frames.enabled;false seems to not be working as expected. Iframes are still shown and JavaScript in them is executed. Doesnt work even after resterting Firefox.
Testing:
I used this pages to test iFrames:
•https://sites.google.com/site/annuairevin/test-page
•http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_iframe
•http://www.quirksmode.org/iframetest.html
After I turned browser.frames.enabled OFF and restarted I noticed that iFrames are still shown on all 3 pages and JavaScript in them would be executed.
By blocking IFRAMES with NoScript blocking turned ON (you have to turn forbidding IFRAMES on manually in options http://i.imgur.com/7jctoTW.png) I managed to block IFRAMES on google and w3school pages.
!!!Text in iframe "Test page in iframe" on quirksmode test page was still shown even after I have frames turned OFF in about:config and I block all scripts and frames and iframes with NoScript.
If I open same page (http://www.quirksmode.org/iframetest.html) with Opera with iFrames blocked in Preferences, iFrame is not shown at all, browser doesnt even render empty square; but JavaScript in it is executed, if you dont disable JavaScript in Preferences > Advanced.
I didnt test Chrome at all.
Possible things that can cause bug:
•I am using NoScript 2.6.7, I turned it off and on but it is possible that it is overriding Firefox settings in about:config. when you serach about:config for "frames" there are many settings mentioning frames from NoScript and AdBlockPlus.
•AdBlock Plus 2.3.2? Same reason as NoScript.
•Fot the first time I noticed Shield in the address bar with "Firefox has blocked content that isnt secure" bubble. http://i.imgur.com/K4FL65n.png. I dont know how long this feature is implemented or what exactly it does, here are some details: https://support.mozilla.org/en-US/kb/how-does-content-isnt-secure-affect-my-safety?as=u&utm_source=inproduct
P.S. Just small remark. If that is true: "Finally, Firefox 23 removes the option to disable JavaScript from the Options pane — and if you had JavaScript turned off, it has been turned back on." There should be some warning when Firefox is updated that JS was turned ON. I think that for me FF updated silently without any messages. OR maybe I blatantly closed some windows, i dont remember well.

The documentation I find on browser.frames.enabled is very vague, but I can't see that it does anything currently. Is this a feature you used successfully in an earlier version?
The Mixed [Active] Content Blocker was turned on by default in Firefox 23. That would explain the shield icon. Not sure whether implementing that might have changed how iframes are handled.

Am using Firefox 5.0.1, any new tabs open with a search engine for imvu and when I go to about:config there is no entry for browser.newtab.url that I can modify

I am using Firefox 5.0.1.4205 with Windows 7 Home Premium Service pack1. My new tabs in Firefox open with a search engine for imvu rather than google as I would prefer. I can't find an answer to my problem so far because when I try the recommended use of about:config and finding browser.newtab.url; it is not listed. Is this version of firefox to old to have that, or is it just missing? What can I do to get my new tabs to open with a Google search engine. This is on my 80 year old father's computer so he is not likely to upgrade browsers as I would on my home computer. Thank you for any help with this.

The new tab page (about:newtab) wasn't introduced until a later version of Firefox (iirc, ''Firefox 10'') , which is why that pref can't be found.
Sounds like your father picked up some Malware.
Maybe this is what you're dealing with.
http://www.shouldiremoveit.com/IMVU-Inc-Toolbar-34367-program.aspx
Also, I see a number of Plugins listed to bee concerned about.
Toolbar Plugin
MindSpark Toolbar Platform Plugin Stub for 32-bit Windows
WildTangent Games App V2 Presence Detector

List of "about:config" commands

Similar Messages

Maybe you are looking for