In the about:config settings what is the preference "browser.taskbar.lastgroupid" do?

I recently installed the FF4Beta6 along side my original 3.6.10 and noticed that both versions have this preference with a user set string value of Mozilla.Firefox.4.0b6. In the taskbar I have shortcuts to both versions pinned in Windows 7. The tooltip box that pops up says "Mozilla Firefox" for the shortcut to 3.6.10 and says "Mozilla.Firefox.4.0b6" for the Beta shortcut. So I don't know what that preference was for and I don't remember ever setting it myself.

Are you experiencing this issue with another browser?

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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.

Firefox 24 Android what is the about:config setting to display the full URL address again?

Firefox 24 Android what is the about:config setting to display the full URL address again?
Example this:
http://www.thewindowsclub.com/eulalyzer-review-download
instead of just this:
EULAlyzer: Free EULA analyzer software for Windows
In the address bar?

hello postewar, set ''browser.chrome.titlebarMode'' to 1.

How do I set the about:config settings for all users? iprism keeps prompting from authentication for users.

When users log on and try to open Firefox 23.0.1, users are prompted with Iprism Authentication. We made changes to the firefox about:config values "network.automatic-ntlm-auth.allow.-non-fqdn" and "Network.negotiate-auth.allow-non-fqdn" to true and it works, but only works on a per user basis. How can we set this up for all users?

I would think the about:config entries discussed are ex-factory set to values each user has to change individually, after the installation has run its course. The solution could be to have patched files ready to install post factum:
[https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences A Brief Guide to Mozilla Preferences - MDN]

Where are the about:config settings for a profile stored?

I am setting up a custom firefox profile and would like to tweak some of the options that are accessed via about:config.
I would like to know where this information is stored and whether I am able to modify these options outside of the browser.

Thanks, I was modifying the prefs.js file the whole time but didn't realize these were the same settings from about:config. The user.js file is also useful to know.

The proxy settings supplied by my work's IT dept. don't work with Firefox on my Nexus. I have entered them in the about:config settings list but to no avail.

I have tried to change the config settings in line with a lsited posting, and these are:
network.proxy.type =1
network.proxy.http = setting from IT dept.
network.proxy.http_port = 8080
Is there anything else I should do?

Are you experiencing this issue with another browser?

The "about:config" move to restore the seach bar didn't work. I'm running OSX 10.9.5 on AOL/Firefox 37.0.1 on a mid 2007 intel iMac

I changed the "browser.search.show.OneOffButtons" boolean to "False" and restarted Firefox. When it didn't restore the search bar I went back and made sure it was entered as "False" and restarted again - no go.
I don't know where to go to search - Am I missing something obvious?
Thanks

Maybe this isn't supported or otherwise overridden by the Firefox version that you use.
Download a new copy of the Firefox application from the Mozilla server and save the disk image file to the desktop
*Firefox 37.0.1: https://www.mozilla.org/en-US/firefox/all/
*Trash the current Firefox application (open the Applications folder in the Finder and drag the Firefox application to the Trash) to do a clean (re)install
*Install the new version that you have downloaded
*https://support.mozilla.org/kb/Installing+Firefox+on+Mac
Your personal data is stored elsewhere in the Firefox profile folder, so you won't lose your bookmarks and other personal data when you uninstall and (re)install or update Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox

My favicons are not showing up for all my imported bookmarks as well as certain current bookmarks and when I open the about:config it says "browser.chrome.favicons;false". Shouldn't this be true and how to I change it?

I had to rebuild my computer and when I imported all of my bookmarks they had no favicons. I started getting some of the favicons when I would go to the websight it would reconnect, but now I can't seem to see almost any of them. I did a search on Google and one tech site suggested the about:config file and that the "browser.chrome.favicons;false" should be set to true. But when I toggle it to true and restart Firefox it is once more set to false. I know it doesn't seem like much, but it is really annoying not having those favicons.
Help me Obi Wan Firefox you are my only hope.

The browser.chrome.favicons preference should be set to true, as it is not retaining the value when you restart Firefox, see the [[Preferences are not saved]] article for possible causes.

How do you save a change made in the about:config area so that I don't have to change it everytime I restart firefox

Hi
I somehow d/l the extension mp3toolbar.com and I disabled it in the add ons section, however it has changed my default search engine from Google to mp3toolbar. I went into the about:config section and changed the keyword entry to google, but everytime I restart Firefox it goes back to mp3toolbar search. This is when I type something in the location bar. I want to know how to change it permanently back to google for default search engine. Please help. Thank you.

See:
*http://kb.mozillazine.org/Preferences_not_saved

Migrate about:config settings from 3.6 to 4.0

Over time, I have incorporated many changes and enhancements to Firefox 3.6, in the about:config settings. Many of these are timing changes or speedups of basic settings recommended by users and others intent on making things faster.
Will it be at all possible to move this over to 4.0, or is that pretty much a "start over" kind of project?

Put those prefs into a '''user.js''' file, to make them more "portable". That makes it a lot easier when you need to ''(or want to)'' create a new Profile with all your special Firefox about:config change.
To get started creating a new user.js file you can open your '''prefs.js''' file in a simple text editor program ''(one that won't change the line formatting appearance)'' and copy the prefs that you changed in about:config into another text window line-by-line. ''(Yep, you need to find them line-by-line, they're going to be intermixed with prefs set by extension that you have installed.)'' When you have all those prefs in the 2nd window, you can add the code needed by the user.js that differs from what prefs.js uses - '''user_pref(" ''' & ''' ")''' before and after the actual pref - type it once and copy&paste each of those two line-by-line for each pref line.'' 
http://kb.mozillazine.org/User.js_file 
It's a lot of work the first time to get started with a user.js file, but it the long run it's a real time and frustration saver. I have been using the same basic user.js file since 2005, and all I need to do is change the few prefs that might get changed in a new version and also add whatever new prefs that I want to set for the new version, for new added features.
''Additional information about using a '''user.js''' file in Firefox:'' 
Firefox looks at the user.js file every time it starts for additions or changes to preferences, and then writes those to the prefs.js file.
'''user.js''' doesn't exist by default, it has to be created. This extension will create that file automatically upon installation and it provides an editing window for the three "user" files from within Firefox. ''You don't have to dig thru your file system every time you want to do a minor edit.''
http://webdesigns.ms11.net/chromeditp.html

About:config settings change by themselves when switching between windows/linux on dual-boot machine with profile shared between OSs

I dual-boot ubuntu and windows7, and have set up firefox to use the same profile data when running under either OS. This works great, except:
(1) each time I switch OSs and start firefox, it runs the "checking add-on compatibility" test (which is a minor annoyance)
(2) each time I start firefox in ubuntu after recently using it under windows, the about:config setting "browser.backspace.action" gets reset from my preferred setting (0) to the default setting (2).
How can I prevent these two things from happening?

Maybe it is better to use separate profiles for each OS and create symlinks or hard links to the sqlite databases that you want to share.
Your Linux profile may be using extensions (e.g. Ubuntu Firefox Modifications) that modify specific settings and in such a case you can't really prevent this. 
You can use a user.js file to initialize specific prefs on each start, but that makes it impossible to make changes on the about:config page that last the current session and you need to remember which prefs are affected.

What value to put in for a preference in the about:config forlder that would allow me to use the f12 key to enable/disable a firefox add-on.

Im trying to set it up so hitting the F12 key will enable/disable Addblock Plus because their are some web sites I need it disabled completely on.
The preference is already there in the about:config screen but the value is left blank for you to fill in if you want to use the feature.
I just need to know what value would represent pressing the F12 Key

'''F12''' is what you need as the string Value for '''extensions.adblockplus.enable_key'''

When I open up a new tab, I get an "AVG" search result. I already did the about:config reset but it still doesn't work. How can I get a blank tab opened?

When I open a new tab, this always comes up:
http://isearch.avg.com/tab?cid={7d7746b8-fb39-4619-86fd-792cbc268005}&mid=72dc207d310ff3c58bd4dbeaeddede3a-fe6a71ecae4eb764a90a5203c991f01a6245f52e&ds=AVG&v=13.2.0.5&lang=es-es&pr=fr&d=2012-06-02%2009%3A32%3A49&sap=nt
I already did the about:config reset and it doesn't make the new tab blank or go to a specific URL address that I type in. What can I do to get a blank new tab? Thanks.

I would just like to add to this thread. I have tried everything and every way listed here and found my own solution, for those of you who were having the same issue as me.
1. Type "'''about:config'''" in your search bar
2. Click "'''I'll be careful, i promise'''"
3. Type "'''newtab'''" in the search bar
4. Find "'''avg.userPreferences.newtabDisabledByUser'''"
5. Set value to '''true''' by either '''doube clicking''' or '''right click > toggle'''
This immediately deactivated the AVG new tab feature and reset my browser to it's default settings.
Hope this helps!

File, Send link doesn't open a new email. Using Firefox 11.0. Outlook 2010 is the Mailto default and W7 default email program. On the About:config page network.protocol-handler.external.mailto is set to regular font (not bold) "default Boolean true".

File, Send link doesn’t open a new email. Running Firefox 11.0. Outlook 2010 is the Mailto default and the W7 default email program. On the About:config page, network.protocol-handler.external.mailto is set to regular font (not bold) “default Boolean true”.

I assume you have tried toggling the setting in Firefox between Outlook and, say, Gmail:
orange Firefox button ''or'' classic Tools menu > Options > Applications
In the search box, type or paste '''mailto''' and pause for the list to filter.
Change the setting and OK to save it, then return to the dialog, change back, and OK again.
You also might want to toggle the setting at the OS level between Microsoft Outlook and the native Windows Mail client in a similar fashion. In Windows XP you could use IE's Options dialog, Programs tab, for this, but I'm not sure in Windows 7.
Since one possibility is a problem in your Firefox settings (including the possibility of interfering add-ons), and another is a problem at the Windows level (e.g., Registry settings), it would be useful to try to identify which one it is. One quick way to distinguish is to create a new Firefox profile. It will start up with all factory settings. You can switch back to your existing profile after testing.
First, I recommend backing up your Firefox settings in case something goes wrong. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
After closing Firefox, start up again in the Profile Manager as described in this article: [http://support.mozilla.com/kb/Managing+profiles Managing profiles].
With the new profile, can Firefox successfully create a message in Outlook?

When the about:config setting for swipe are changed to allow changing tabs with swipe it does not repond and performs the default back and forward in browsing history action on the selected window instead of switching tabs. How do I get it to work?

In about:config, the values I changed to for the preference name browser.gesture.swipe.left was Browser:PrevTab and for browser.gesture.swipe.right was Browser:NextTab.
I have the latest synaptics touch pad on my laptop and it supports three touch swipe on windows pcs and on firefox. The about:config setting seem to be specific for MACs and so does not responds to windows changes.

Hi,
I suggest you try the steps in this thread for test:
Disable Suggested Sites does not work.
http://answers.microsoft.com/en-us/ie/forum/ie9-windows_7/disable-suggested-sites-does-not-work/4ba064b1-1c6e-43f1-939e-2db1d335b2ef
Regards,
Vincent Wang
TechNet Community Support

In the about:config settings what is the preference "browser.taskbar.lastgroupid" do?

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