Firefox 4, about:config tab resizing has no effect

I recently upgraded to Firefox 4. Through about:config, I'd previously set my max/min tab width to around 20 px, as I often have many tabs open at once.
In 4, however, these settings are apparently ignored. Please advise.

The about:config settings have been removed in favor of using css - https://bugzilla.mozilla.org/show_bug.cgi?id=574654
You can change them by using the Custom Tab Width add-on - https://addons.mozilla.org/firefox/addon/custom-tab-width/

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Keyword.url field bloked for changes in a firefox about:config tab (firefox with yandex)

keyword.url field bloked for changes in a firefox about:config tab (firefox with yandex)

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration 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
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

About:config tabs min size doesn't work

about:config tabs min size doesn't work.

The about:config settings for setting tab widths have been removed from Firefox 4, to set tab width you can use the Custom Tab Width extension - https://addons.mozilla.org/firefox/addon/custom-tab-width

Howo would i edit firefox in about:config to prevent my children from lookin up anything explict?

i have children that use a desktop that is shared within the family. how would i edit firefox thru about:config to prevent them from lookin up or accidently coming across explict content?

You can't do that reliably with Firefox. You need to use external software to allow only access to approved sites and block access to sites that you do not want to visit them.
See also:
* http://kb.mozillazine.org/Parental_controls
* http://en.wikipedia.org/wiki/List_of_content-control_software
* http://en.wikipedia.org/wiki/K9_Web_Protection

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

Firefox warns about closing tab so as not to loose the content, can I disable this?

I have various browsing sessions, one is for email, one for studies etc. With one of the browsing sessions when I try to close a tab, firefox asks if I really want to close this tab, because for some reason it thinks I'm writing a message. This is really starting to get on my nerve, not because of firefox, but because of the website that triggers these popups.
Is there a way to disable these?
I've trying so hard to find an answer, so I would be really grateful for your help!
Blessings,
Janne

That is caused by a script that run on the page and is triggered by an onbeforeunload event
*https://developer.mozilla.org/en/DOM/window.onbeforeunload
*https://developer.mozilla.org/en/DOM/window.onunload
You probably can't disable such a warning alert, but you can check if you can find a Greasemonkey script to disable such an event
*void(onbeforeunload = null);
*Greasemonkey: https://addons.mozilla.org/firefox/addon/greasemonkey/

Is there a setting in Firefox's about:config page that will allow the Bookmarks Drop Down Button to show while the Menu Toolbar is visible?

I understand that someone asked a very similar question in this post: https://support.mozilla.org/en-US/questions/977490?esab=a&as=aaq but I want to accomplish my goal without adding another addon or extension to my browser.

Add code to the userChrome.css file below the default @namespace line.
*http://kb.mozillazine.org/userChrome.css
<pre><nowiki>@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */
#bookmarks-menu-button,
#bookmarks-menu-button-container { display:-moz-box !important; }</nowiki></pre>
The customization files userChrome.css (user interface) and userContent.css (websites) are located in the chrome folder in the Firefox profile folder.
*http://kb.mozillazine.org/Editing_configuration
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)

Reset to 'default' for all printing functions in about:config doesn't work.

I have followed the instructions for resetting FFox printer interface to "default", where it should normally be, to the letter: http://kb.mozillazine.org/Problems_printing_web_pages#Reset_printer
The system keeps flipping all the printer settings back to "User". Somehow it went into "User" setting 2 weeks ago, and I was able to correct the problem for a few days by following the instructions on the web page above, resetting just the print.print_printer line, alone. Now, ALL the other "print" lines below this will NOT remain in "default" mode once I've closed the about:config page (tab), or closed the browser and re-opened it, under any circumstances. The problem manifests as: When I try to print, starting from ANY true print command location and finally clicking "OK" to begin printing, I get a small rectangular box saying only, " an unknown error occurred while printing". The box has one of those yellow triangular signs with an exclamation point in it, if that helps. There's no error no. If there's something about the WAY I'm supposed to close the about:config tab, and/or close the browser that is SPECIFIC, I hope someone here can tell me the way I'm supposed to execute this. Thank you.

1) Any chance that printer shows as "offline" in the printers window in the Control Panel?
2) Local or network printer?

How can I completely disable ssl3.0? about:config does not have security.enable_ssl3

Latest discovery by Google says even though I use TLS, I may be configured to be backward compatible to SSL3.0 and a "Poodle" attack by a predator website might induce me to use SSL3.0 and be vulnerable to attack. They say the cure is: "To prevent POODLE attacks on Firefox, open about.config, search for "security.enable," and set "security.enable_ssl3" to false."
First mistake is "about.config" should be "about:config". Second problem is there is no "security.enable_ssl3" line to be found. I don't know if I'm supposed to create the line, and if so, how do I do that?

A new extension has been released to "fix" Firefox 26 and later versions, until Firefox 34 is released on Nov 25th with the fix built-in.
https://addons.mozilla.org/en-US/firefox/addon/ssl-version-control/

I can't seem to remove Incredibar from about:config. When I reset, it still comes back

I have removed ALL instances of incredibar/incredimail from my laptop. When I go into the Firefox configuration (about:config), I reset ALL of the incredibar extensions. However, when I restart Firefox, ALL of the incredibar extensions come back. This is really annoying because I have completely removed incredibar. Please help. Thanks
-James Sullivant
P.S. I don't want to lose any of my Firefox customizations, either.

Hope this video helps you to get rid of it. [https://www.youtube.com/watch?v=gVNwJPuy898 How to Remove Mystart By Incredibar Toolbar from Firefox]
edit additional information and preliminary steps suggested by a moderator ~J99
# '''Read [[Reset Firefox preferences to troubleshoot and fix problems]] ''' note you will lose some information including open tabs, and any extensions will be uninstalled.
# You may wish to Close all unnecessary open tabs. Boookmark any open tabs, and the home websites of all Firefox extensions that you have installed. See also [[Find and install add-ons to add features to Firefox]]
-----

About:Config opens for a fraction of a second, then returns a blank page

When attempting to open Firefox's about:config page, it shows the confirm/warning screen for a fraction of a second, then seems to redirect to a blank page.
I first noticed this just after installing Minefield, which I have now uninstalled - though I do not use about:config often and the issue could have started before then.

Did you use the same Firefox 3.6.x profile folder with the Minefield 4.0 version?
You should be careful with doing that because the two versions are not compatible (some files may get upgraded; extensions.sqlite) and you can get problem if you use that profile in the future again with a 4.0 version.
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). 
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
Create a new profile as a test to check if your current profile is causing the problems 
See [[Basic Troubleshooting#Make_a_new_profile|Basic Troubleshooting: Make a new profile]] 
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" 
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files) 
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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.

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 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.

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

Firefox 4, about:config tab resizing has no effect

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