Does remain built-in Firefox customization? (aka about:config)

I mean, the advanced settings does remain even in the future Firefox's developments?

Hi zoli62, the new button menu is quite similar to the old orange Firefox button menu. I have some maps comparing them:
http://jeffersonscher.com/res/menu/comp.php
Anyway, most major changes in Firefox take years, so there will be plenty of time to object to bad ideas.

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Javascript not working in Firefox 32.0 - about:config says enabled - but web pages say different

For example maps not loading on hotel pages. Various other errors appear now on web pages saying ' You must have JavaScript enabled'. I'm not a computer person, but I can see from about:config says its enabled -
javascript.enabled;true
Any other suggestions???

You can open the Web Console (Firefox/Tools > Web Developer).
Check on the Network tab if any content is blocked and has a file size 0 (zero).
*https://developer.mozilla.org/Tools/Web_Console
You can try these steps in case of issues with web pages:
You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)
Clear the cache and remove cookies only from websites that cause problems.
"Clear the Cache":
*Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox > Preferences > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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

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.

How can I remove Blingee Search Canvas files from Firefox (Files can be seen in about:config).

Though I followed the steps to another helpful answer here on how to change Search Canvas from my default search browser, the files remain seen when I type in 'about:config', and I'm quite concerned for safety. When typing in 'about:config', the following files show:
blingee.Var1
blingee.Var10
blingee.Var2
blingee.Var3
blingee.Var4
blingee.Var5
blingee.Var6
blingee.Var7
blingee.Var8
blingee.Var9
blingee.cache.bgtb_include_xml_details
blingee.firstlaunch
blingee.guard.defaultengine_keyword_url (I cleared the 'Modify' text/URL in this one, which I hope was not a bad decision...)
blingee.guard.defaultengine_name
blingee.guid
blingee.popupblockedcnt
I already uninstalled/reinstalled Firefox to no avail.
I would be extremely appreciative of any help. Thanks very much!

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!

About:config in FF for Android

Hello,
I am using Firefox (version 32) on a rooted Samsung Galaxy S4 with Android 4.2.2.
I was trying to change some settings in Firefox using about:config, especially the suggestions in the urlbar from bookmarks/history. I set browser.urlbar.maxRichResults to 0, and browser.urlbar.autocomplete.enabled to false, but its still showing me lots of suggestions from my bookmarks as i start typing in the address bar and doing autocomplete. Setting the value of maxRichResults to another number like 1 also doesnt work.
I also made other changes in the about:config which were not adopted.
I tried restarting firefox (changes in the about:config are visible), I restarted my phone, wiped Firefox Cache, wiped Firefox data using Titanium Backup and tried it on the fresh Firefox, but the problem persists.
What am I doing wrong?
I really love firefox on my desktop, but if i cant make any changes in the about:config for mobile FF, then the search suggestions will drive me crazy. ;)
Any help is greatly appreciated!

Thank you for clearing that up for me, I wasnt aware that those dont apply for FF for Android. I was trying to get rid of the URL Suggestions that pop up as soon as you start typing sth in the urlbar, sourced from your history and bookmarks. I disabled them in normal Firefox by using about:config so I was hoping it'd work here too, since there is no setting for it. Thanks for answering anyway.

XML does not render inside iframe using the built-in Firefox renderer as of Firefox 17.0.1

We make a Content Management system that renders XML inside of iframe in a few different areas. As of Firefox 17, these iframes no longer render using the built-in Firefox XML renderer but instead as plain text.

A good place to ask advice about web development is at the MozillaZine "Web Development/Standards Evangelism" forum.
*http://forums.mozillazine.org/viewforum.php?f=25
The helpers at that forum are more knowledgeable about web development issues. 
You need to register at the MozillaZine forum site in order to post at that forum.
It is probably best if you have a web page with example code, so they can test this themselves.

I changed the "keyword url" setting in about:config to allow it to be used as a google search box, but when I exit and restart firefox it reverts to its previous setting.

chrome://browser-region/locale/region.properties
This is the URL that is in "keyword:URL" in about:config in my Firefox 4. I attempted to change it to http://www.google.ie/search?q= so as to use the address bar as a search bar. It works fine while Firefox remains open, but when I exit and come back later to open Firefox and use the address bar for search items I find that it has reverted to the default setting.
Can you please help me resolve this issue?
Thanks

See:
* http://kb.mozillazine.org/Preferences_not_saved
You can start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
* [[Troubleshooting extensions and themes]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
In Firefox 4 you can use one of these to start in [[Safe mode]]:
* Help > Restart with Add-ons Disabled
* Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)

Firefox android opens to about.config as home page. unable to set new home page

firefox android always opens new tab or browser session on about:config page.
I've restarted browser and tablet(Samsung Galaxy Tab 3), and this behavior still persists.
All google searches suggest that the firefox android browser home page cannot be changed but this is obviously not true.
I've tried solutions that suggest navigating to about:home and modifying bookmarks and these paths do not work.
The awesome bar is far from awesome!!!!!!
How do I stop the browser from starting at about:config and how can I make the home page be what I want?

In the about:config page entry on the desktop there is a homepage entry, but does not show up on my android, odd.
Try this > Settings > Customize > Home
Change setting here and open a new tab to see if changes are made.
Also check the about:addons page to see if you have any homepage add ons that has saved the about:config page as the home page.
Looking forward to your reply!

Macbook Pro Pinch/Zoom feature does not work with Firefox 6

Can someone please tell me how to fix this major problem?
I can not get the Pinch/Zoom feature on the track pad to work on my Macbook Pro. I am running OS 10.6.8.
I have seen this below in other posts, and have tried it, but it STILL does not work !!!!
'''''Some gestures have been removed in Firefox 4.
'''You can restore the zoom feature by changing the values of the related prefs on the about:config page.
'''browser.gesture.pinch.in -> cmd_fullZoomReduce 
'''browser.gesture.pinch.in.shift -> cmd_fullZoomReset '''
'''browser.gesture.pinch.out -> cmd_fullZoomEnlarge '''
'''browser.gesture.pinch.out.shift -> cmd_fullZoomReset ''''''
'''To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.'''
'''If you see a warning then you can confirm that you want to access that page.'''''''''''
Please someone help me - this is a great feature and its really pissing me off that I can't use it.
HELP !!!

I'VE TRIED THIS:
browser.gesture.pinch.in -> cmd_fullZoomReduce
browser.gesture.pinch.in.shift -> cmd_fullZoomReset
browser.gesture.pinch.out -> cmd_fullZoomEnlarge
browser.gesture.pinch.out.shift -> cmd_fullZoomReset
browser.gesture.pinch.latched -> false
I'VE TRIED ALL OF THE ABOVE NUMEROUS TIMES AND IT DOES NOT WORK ON MACBOOK PRO AND FIREFOX 6.
CAN ANYBODY HELP? THANKS ♥

Firefox will open 4 or 5 tabs fine, but then will not load any further websites after those first 4 or 5, or allow you to refresh one of those first tabs -- including about:config and the addon page

Firefox 5 worked fine. I installed Firefox 7, and when I ran it, tabs would just say "connecting to..." and hang. Restarting did not help. Websites open fine in IE and Chrome. Disabled all firewalls and antivirus, did not help. Uninstalled and reinstalled Firefox 5, everything worked fine again. This was using Vista 64-bit.
Upgraded to Windows 7, uninstalled Firefox 5, installed Firefox 7, had same problem. Uninstalled Firefox 7 completely (including the profile information, I saved that information in another folder), restarted computer, and installed Firefox 7 using a completely clean profile. Did not install any add-ons, checked to make sure all plug-ins were up-to-date, and updated plugins.
Now when I start Firefox, I can load 3 or 4 or 5 tabs fine -- after those first few tabs are open, I cannot open or refresh any other tabs -- including about:config and the add-on manager -- I have to restart Firefox. The hangup doesn't appear to be related to what websites I am attempting to open, but it looks like the number is the problem. I have run through all of the FAQ procedures, including changing the max number of network connections to 48, and the problem does not seem to go away.
As a side note, I had this same problem when I tried to go from version 5 to version 6 as well. Version 5 is the most recent version that worked on my system.

Can you try Aurora - download it from http://www.mozilla.org/en-US/firefox/channel/
And let us know how it works.

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.

How can I set Firefox (in about:config?) to NEVER bother me with update notifications?

Welp, the question says it all. Or almost all of it. I DETEST the latest, MENU-LESS version of Firefox (and it DOESN'T help that, by standing on my head and spitting wooden nails in a particular direction, I CAN actually find everything contained in the old menus), and therefore I force-installed the previous version (28.0), but my problem is that I am still pestered with prompts that urge me to upgrade to version 29.0. I resent THE HELL OUT OF THAT! I resent ANYTHING NANNY-LIKE that is IN MY FACE!
So, I thought that by setting certain app.update parameters, I could be rid of that UPDATE SCOURGE - and in fact, it seems to have worked on my Linux-only desktop - but, alas, no, it is still there, still very much IN MY FACE on my dual-boot (openSUSE & Win7) desktop PC!
What, then, can I do to be rid of those update prompts? (Note that I am hoping that at some point in a not too distant future, Mozilla will offer, for each new version, a WUS and an I'M THE MAN variant, where the latter allows the user to steer the vehicle, as it were... if this never materializes, then at some point (when I deem Firefox 28.0 to be too unstable to use any longer), I will ditch Firefox in favor of an alternative that retains a semblance of the male's hobby-garage look (as oppose to HER slick, everything-hidden, kitchen-cabinet look!).
Thanks!
I am running openSUSE 13.1 in dual-boot iwith Window 7, and it is only on the SUSE interface that I am having the problem (on Win7, earlier versions allow me to tick a 'don't install anything, ever' box via preferences, rather than having to seek a solution in about:config). Right now I am using Firefox 28.0, having force-downgraded from the latest version.

The Link I gave you above won't tweak Firefox but rather give you a brief overview on what's new in Firefox 29.
The link below will show you how to customize Firefox 29 to look like previous versions of Firefox before 29.
*https://support.mozilla.org/en-US/kb/how-to-make-new-firefox-look-like-old-firefox
I also mentioned you can toggle some prefs in about:config to disable automatic updating
You can set these prefs in about:config to disable automatic updating: 
app.update.auto - false 
app.update.enabled - false 
app.update.silent - false

Is there a way to disable the HSTS ( HTTP Strict Transport Security ) list built into Firefox or to allow exceptions?

HSTS is problematic in that it incorrectly assumes that all users trust the default list of CAs and makes the adding of exceptions impossible even by advanced users.
For example, torproject.org is inaccessible on Firefox unless I am willing to trust DigiCert to never sign a fake certificate either by negligence or by court order of any country in witch they operate, thereby making every https: site ( not just torproject.org ) vulnerable to a MITM attack.
A user disabling CAs in the browser is not unreasonable given the ever growing list of CAs built into Firefox ( each one a potential point of failure ), the number of CAs that have been recently compromised and the very low standards required to obtain a certificate.
While I understand the desire to protect the average user who doesn't understand how certificates work and will click past warnings without reading them, this protection should not come at the expense of more security conscious users.
I would recommend an about:config setting that would allow the creation of exceptions by users who explicitly choose to do so.
So far the only kludge I have been able to come up with is to modify c:\program files\mozilla firefox\xul.dll with a hex editor and replace the sites on the list ( this is far from an ideal solution ).

dumdidadida: Thanks for your reply, but it doesn't address the problem. HSTS is designed to FORCE the use of https, this is a good thing in most cases. However, HSTS is problematic in that it incorrectly assumes that all users trust the default list of CAs and makes the adding of exceptions impossible even by advanced users.
torprojec.org is just an example, this effects every HSTS site. You can reproduce this problem yourself in version 17 or later if you temporary disable "DigiCert High Assurance EV Root CA" in your certificate store and then visit torproject.org. You will notice the ability to add exceptions has been removed and that the cert_override.txt file found in the user's profile is also ignored.

The print.print_to_filename option in about:config no longer works in Firefox 10 for Linux

I have an older linux box with firefox 3, I believe. And, in about:config I can set the option print.print_to_filename to a path then when I print it defaults to the path I want it to save the PDF to. However, on my new box which has FF10.01 such option doesn't exist and creating it doesn't seem to have any effect. Was this removed? It was a great feature. I don't want to have to install and configure cups again as firefox does the job fantastically. Is there a workaround or can this be brought back in the current version?

The problem exists with https://www.nytimes.com/ so, as a workaround, you can use http://www.nytimes.com/ (not https) or http://nytimes.com where I don't see the problem.
Related bug report, if anyone wants to keep track, so that they can reset the '''security.mixed_content.block_active_content''' preference, when it's fixed (read [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html Bugzilla Etiquette] before commenting in bug reports):
*[https://bugzilla.mozilla.org/show_bug.cgi?id=862164 Bug 862164] - https://www.nytimes.com/ does not render properly because of mixed content blocking

Does remain built-in Firefox customization? (aka about:config)

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