Reset about:config

I followed a Mozilla Support article about manually uninstalling a plugin. I got the plugin removed but I remember I had to change a value from true to false or from false to true in the about:config of my Firefox browser. I can't, for the life of me, find this article again and can't remember if I changed this value back afterwards.
First of all, does anyone know what article I'm talking about?
Would this value be something that could negatively affect my experience? (Change something or make something not work right until it's reset to the original value?)
And finally, would uninstalling and reinstalling Firefox reset all the values in the about:config? Would something special need to be done to make the about:config reset? (I don't particularly want to delete all my bookmarks, logins, preferences, etc. though...)
Thanks!!

BTW, that pref isn't need to view the full path to plugins in Firefox 22.0 - plus versions. '''about:plugins''' automatically shows the full path without changing plugin.expose_full_path to true.
And any users who did toggle that preference to true in the past should change it back to false.

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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.
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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 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!

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
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1) Any chance that printer shows as "offline" in the printers window in the Control Panel?
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To solve another problem, I need to reset my user agent. But when I type about:config in the address bar, all I get is a Firefox window that has the text "config" on the page and nothing else. No text or fields or ANYTHING. What can i do short of unins

Firefox 3.6.3
Windows XP
Otherwise browses OK.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Make sure that you type '''about:config''' in one word and without any spaces in the location bar.
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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
See also:
* http://kb.mozillazine.org/Preferences_not_saved

Reset is grayed out in the about:config page after right clicking on specific comands to reset. What do I do?

After being redirected by instructions in your forum, to fix a error message that says that I am using a incompatible browser. Went to about:config then, typed "useragent" in filter line, then to right click on preference name, to click reset. The reset is grayed out, therefore do not present the option to reset. Why is this, and what do I do now?

It is not the user agent as it works for me with your user agent. 
Disabling cookies or Flash or JavaScript also gives a specific error message, so I don't know what it is in your case.
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]]

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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).
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*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*http://kb.mozillazine.org/Preferences_not_saved

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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]]
-----

Stop the updates. I told it not to update in the prefs, I reset everything I could find in about:config and it still updates. How do I make it stop.

I have checked all boxes pertaining to auto updates, I have found more settings in about:config and set those appropriately. Still FF autoupdates. How do I make it stop? FF has the options to stop updates, when I use them the updates continue, why are those options there if they do not work?
I read the previous posts on updating, I understand the risks, I fully understand what I am doing when I make this choice. Please do not lecture me.

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I removed MySearchdial which somehow was installed but the references still show up in about:config.

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My browser appears to be working normal, but it seems these references shouldn't be there if I deleted the extention/add on.
Any suggestions? Doesn't seem like you can delete a line in about:config.

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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

Reset about:config

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