Checking compatibility of add-ons always running after update

After updating Firefox to version 6, the checking compatibility of add-ons is always running with each start of Firefox, and "Welcome to Firefox" site is always opening as well.
This is very disturbing.

Apparently I wasn't clear or the word upgrade wasn't right. I meant going from 4 to 5. I downloaded it, installed it and got no option resembling that at all, it just saved a DMG to my hard drive and then told me to put it in my applications folder as always. I opened it and that was that, no compatibility check. I already got one error about an add-on that's vital. I'd backed up before I installed and saved Firefox 4 as a separate file before opening 5, I hope I'll be able to go back to it. The old system was really much better, what's the point of finding out after you already installed something if your systems will work? Or of avoiding installing because you're afraid they might not when everything very well might be fine? I can guarantee you that I won't be installing an major updates for a very long time, that's for damn sure.

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After updating firefox the first window after opening first time "checking compatibility of add-ons" window is froze won't progress pas 1/3 of completion

I updated my fire fox on my MAC OS X to 3.6.6 version of firefox, everything went smooth till I open FireFox then the window firefox update opens up and about 1/3 through the process it gets stuck on Checking Compatibility of Add-ons and doesn't go any further. I have hit cancel and firefox opens but it doesn't open any web sites. I have removed firefox and re-installed and it is still doing the same thing. I have also let it run over night thinking it may just take a while and it never progresses, please advise, I am new to MAC but FireFox is the only browser on my mac that will open one of my business pages, known issue with mac for this company.
== This happened ==
Every time Firefox opened
== trying to upgrade firefox ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-us) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16

Try "Reset all user preferences to Firefox defaults" on the [[Safe mode]] start window - See http://kb.mozillazine.org/Resetting_preferences
Delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
If you see disabled extensions that are not compatible on the next start in "Tools > Add-ons > Extensions" then click the "Find Updates" button to do a compatibility check.

How do I completely disable initial "Checking Compatibility of Add-ons" pop-up for all users on a Citrix server where the FireFox was upgraded to 29.0.1

I have a set of Citrix servers, we need to upgrade the FireFox on them to 29.0.1
When I have done this, and a user runs FireFox, now the users are being presented with a pop-up "Checking Compatibility of Add-ons" which delays the start of FireFox.
I need to prevent this so users just see FireFox start up without any delays.
I have installed the add-on that re-enables extensions.checkCompatibility and tried various ways of implementing it like pref("extensions.checkCompatibility", false);
However we seem to have a situation where the add-on that enables the setting is not loaded yet so the setting is not implemented.
How do I solve this for all users?

You can try to set the browser.startup.homepage_override.mstone pref to ignore on the about:config
*http://kb.mozillazine.org/browser.startup.homepage_override.mstone
You can use a mozilla.cfg file in the Firefox program folder to specify new (default) values and possibly lock prefs.
Place a local-settings.js file in the defaults\pref folder where also the channel-prefs.js file is located to specify using mozilla.cfg.
pref("general.config.filename", "mozilla.cfg");
These functions can be used in the mozilla.cfg file:
defaultPref(); // set new default value
pref(); // set pref, but allow changes in current session
lockPref(); // lock pref, disallow changes
See:
*http://kb.mozillazine.org/Locking_preferences
*http://mike.kaply.com/2012/03/16/customizing-firefox-autoconfig-files/
*http://mike.kaply.com/2014/01/08/can-firefox-do-this/

"Checking Compatability of Add-ons" Update window at each startup & redirects to a welcome page. Tried disabling all add-ons & updates / force compatability checker. Thoughts?

Each time I start Firefox a "Checking Compatibility of Add-ons" update window appears, which redirects me to a welcome to Firefox 5.0 page with my normal home page in another tab. I tried disabling all add-ons and updates as well as the force compatibility checker. I think my AVG safe-search bar might be causing the problem, but I have it disabled and never use it. Please help me get rid of this.

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

I cant open firefox.. it was checking compatibility of add ons and wont quit checking

icant open firefox.it was checking compatibility of add ons and wont quit. this comp is suck a mess . spend your time fighting with one thing. i tell everyone i know not to buy one this thing is a mess cant open apps .why not let them open then a person could get rid of the ones we dont want. it sure is disguesting. you click on them drag them and they fly back up. some fun .comp are supposed to be able to look things up and read the news . not play around chasing apps .. why change . the xp was a real nice comp. did`nt need to chase apps around and still do`nt get them open. i cannnt say one good thing about this comp. it is a big big head ache

I am not clear what your problem is and importantly whether you are trying to ask for help with Firefox.
If you have a Firefox problem can you explain what you need help with please. If the problem is with a new Windows 8 operating system you will need to find a suitable forum to discuss that.
A websearch will turn up many suitable fora one possibility is
* http://windowssecrets.com/forums/forumdisplay.php/66-Windows-8-Forum
The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.
If you want to leave feedback for Firefox developers, you can go to the Firefox ''Help'' menu and select ''Submit Feedback...'' or use [https://input.mozilla.org/feedback this link]. (You'll need to be on the latest version of Firefox to submit feedback). Your feedback gets collected at http://input.mozilla.org/, where a team of people read it and gather data about the most common issues.

How to stop FF checking compatibility of add-ons every time it starts.

Since upgrading to 4.0.1, FF checks compatibility of add-ons every time it starts. How to stop this?

Did you delete prefs.js in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder]?
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
This can also be a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry. New files will be created when required.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the "Find Updates" button (Firefox 4: click the Tools button at the left side of the Search Bar) to do a compatibility check.

Firefox checking compatibility of add-ons every time it starts.

Every time I upgrade, Firefox begins checking compatibility of add-ons every time it starts. And it brings up the "Hooray! Your Firefox is up to date" page every time too. How to fix?

It's Problem With Your Firefox Profile... Just Visit http://www.maherhackers.com/solved-firefox-checking-add-on-compatibility-every-time/ For Solution.

Checking compatibility of add-ons BEFORE upgrading

There used to be a feature that would pop up with announcements that major Firefox upgrades were available where you could run a compatibility check with your add-ons before you upgraded. This current system where you upgrade and then hope that your favorite add-ons work and just report them if they don't is frankly useless. My add-ons are more important to me than any new features 5.0 is offering. I'm not as worried about security as I am about convenience. Add-ons are the reason I use Firefox and if they don't work then I don't need it. So is there a way to check compatibility before I upgrade? I've looked and can't find it and I've searched help and can't find an answer. Thanks in advance for your help.

Apparently I wasn't clear or the word upgrade wasn't right. I meant going from 4 to 5. I downloaded it, installed it and got no option resembling that at all, it just saved a DMG to my hard drive and then told me to put it in my applications folder as always. I opened it and that was that, no compatibility check. I already got one error about an add-on that's vital. I'd backed up before I installed and saved Firefox 4 as a separate file before opening 5, I hope I'll be able to go back to it. The old system was really much better, what's the point of finding out after you already installed something if your systems will work? Or of avoiding installing because you're afraid they might not when everything very well might be fine? I can guarantee you that I won't be installing an major updates for a very long time, that's for damn sure.

My installed add-ons always disappeared after PC restart that I have to install them all over again, is there any solution?

Lately after last upgrade of Fierefox, my add-ons suddenly disappeared, after I turn on my PC. So I have to install them all over again, than everything work fine. But this morning it happened again, my add-ons disappeared. I try to looking for an answer but have no luck.
My add-ons that alwys disappeared after restarting PC, are :
1. Adblock
2. DownThemAll
3. DownThemAll Anti container
I'm not install these add on while I'm asking this question.
Is there any solution for this problem?

Avast software has been reported to cause this problem.
*Avast suddenly doesn't like several Firefox add ons:<br>**https://forum.avast.com/index.php?topic=160289.0<br>**https://forum.avast.com/index.php?topic=160289.msg1152011#msg1152011
*Latest Avast reportedly deleting Firefox add-ons - gHacks Tech News:<br>**http://www.ghacks.net/2014/11/16/latest-avast-reportedly-deleting-firefox-add-ons/

With version 5, on starting get a box "checking compatibility of add-ons" then to Firefox home page not my home page--What's happening?

Just installed version 5. As above I get the box then it goes to Firefox home page not my home page. I've updated and/or disabled every add-on or extension and it made no difference. I am in a university behind a tough firewall. I'd love to go back to version 4 but that isn't available.

Disabled add-ons will still be checked and can still be updated.
I don't know why you are continuously getting the message, you should only get it when there is a version change.
You can try solutions in https://support.mozilla.com/questions/817681 but you had better make a list of what extensions you had disabled first, because all of your extensions will be enabled when you delete/rename those files in your profile. You can use about:support to get a list of your extensions. (renaming is safer than deleting).

All (nearly) add-ons / extensions disappear after update to v15 then v16

This has happened to me twice now. After a FF update (first to v15?) all or most add-ons / extensions disappeared, didn't even appear in the menus. (At least I am sure my critical extensions (see below) were missing earlier. It has been awhile.) After trying the solutions posted in various topics I finally gave up and created a new profile. I installed my more critical add-ons, Firebug, Flash Firebug and Restartless restart. Everything was fine until the latest update to 16.0.1. Once again all add-ons disappear, including from the menus. Curiously "clear recent history" also seems to have been missing until I deleted the extension and compatibility files.
Going back to my previous profile, after deleting the extension and compatibility files and reloading FF I see that some add-ons now appear but not my critical ones.

@cor-el,
So... With FF closed I deleted localstore.rdf, compatibility.ini, extenstions.* and addons.* files. Start FF, the files rebuild. No extensions appear so no change.
As a test I created a new profile and added extensions and of course, everything worked fine. Then I got slightly smart and restored the entire profile (and just that profile) from a backed up version before the FF update. Everything works again!
Conclusion: Something in the FF update process corrupted something other than the files we discussed above causing (nearly?) all add-ons to not work. So far it appears that whatever the update changed in the profile was not needed as restoring an older profile version seems to work fine.

After updating firefox to 6.0.1 and again after 6.0.2, Firefox checks compatibility of add-ons on EVERY start, and also resets the homepage back to default. How can I fix this?

The problem persists with Firefox in Safe Mode

See:
*https://support.mozilla.com/kb/Preferences+are+not+saved
*http://kb.mozillazine.org/Preferences_not_saved
* https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox

Just updated to v5.0 and now when I start Firefox I get a pop-up that says checking compatability of add ons and the the Welcome to Firefox page and my home page appears. Can't get rid of the pop up or welcome page.

Above question covers it. I've tried reinstalling Firefox, clearing cache, history, etc. but still happens. I've created app tabs and when I restart Firefox, they are gone. Running Windows XP.

It is probably because you are not properly closing Firefox. Restarting your system would make sure that Firefox had terminated, but you do not have to do that.
To properly close Firefox on Windows systems, use
:File > Exit or "Firefox:" button > Exit
When you get the message "Firefox is already running" it is too late, and you must force termination of Firefox through the Windows Task Manager before restarting Firefox. Windows 7 has a keyboard shortcut to save you a step "Ctrl+Shift+Esc" then on "Processes" tab, select "firefox.exe" and use the "End Process" button. More thorough would be to right-click on the "firefox.exec" and choose "End Process Tree".
You would find firefox.exe in a Mozilla folder in your program files, but y0u would not want to delete it there, you would need to use the Control Panel which you have already identified and do it from there -- but generally you would not need to do that, and there is nothing in what you have posted to indicate that you should. But if you did do that, then don't let the install start Firefox for you as you would want to use you existing desktop icon or method of starting Firefox, and should decline having Firefox install start Firefox for you. When the install starts then invoke Firefox in your normal manner. This should eliminate problems of creating a new profile rather than using your old profile.

Firefox opens with a window that says "Checking for compatibility for Add-ons" then it always opens 2 tabs... one with my home page and one that says Congratulations, Firefox is up to date. How can I stop it from starting that way?

Firefox opens with a window that says "Checking for compatibility for Add-ons" then it always opens 2 tabs... one with my home page and one that says Congratulations, Firefox is up

Hi konee,
You should look at [https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox this article about that specific issue] and the article [http://kb.mozillazine.org/Preferences_not_saved Preferences not saved]. These should give you all the information you need!
If that doesn't work:
# Type about:config in the address bar
# Click ''I'll be careful, I promise'' if prompted
# In the Filter input field type ''startup''
# Double click on startup.homepage_override_url
# Delete the text string and click ''OK''
# Close Firefox and reopen the window to verify that it has worked.
Hopefully this helps!

Updated to FireFox 11 and I keep getting "checking compatibility of add-on" when I start the browser.

I just updated to FireFox 11 and whenever I start the browser, I get that annoying window that checks for the compatibility of add-ons.
I have looked around for solutions and have tried the following:
1. Deleting several extension files from the profile folder.
2. Going to about:config to disable the extension:checkcompatibility (does not exist there).
None of these worked.

Did you try to delete the file prefs.js?
*http://kb.mozillazine.org/Preferences_not_saved
*https://support.mozilla.org/kb/Preferences+are+not+saved
Which security software (firewall, anti-virus) do you have?
Some security software has virtualization features that can cause problems by protecting and restoring files in the Firefox profile folder.

Checking compatibility of add-ons always running after update

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