All add-ons / extensions are missing as if not installed. (ff4.0.1)

I'm currently using Firefox 4(.o.1). when i checked the add-ons manager, in the "extensions" tab, there are no extensions and it says here "you don't have any add-ons of this type installed". i've restarted the browser a few times and my laptop once, and no changes at all except for one lucky time when it seems normal. i don't know whether it is there but no one can see it or what. i've been using adblock plus and so far, i see no ads/popups.

Just try to install (any) new add-ons and restart firefox.

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After updating to v. 24.0 (and restarting) ALL add-ons (regardless whether they work or not) are marked "(disabled)", and clicking Enable button does nothing

After updating to v. 24.0 (and restarting, several times) ALL add-ons (regardless whether they work or not) are marked "(disabled)". I tried clicking "Enable" button for each add-on and nothing happened. There is only one add-on which is marked as incompatible with this version (but it was also incompatible with previous version, and so marked).
Clicking "Update Add-ons", gives a short list of add-ons but "Install Updates" button is pale and doesn't work. I can only sort list by name or last update.
Also, I disabled Ask Toolbar and that went well. When I click "Enable" button (button works ONLY for this add-on) it takes forever to get note: “Ask Toolbar will be enabled after you restart Firefox”, I used to get this info in seconds time before this update. (I do not really want Ask Toolbar, I just used it to see whether if I disable and then enable an add-on might do the trick.)
Bottom line – I can not tell if add-on works (i.e. if it is enabled or disabled) unless I try using it.
Even when I posted this question and installed Troubleshooter, it's also marked as "(disabled)"

You're welcome
Are this screenshots from an extension window because the built-in about:addons page looks different?

How come absolutely none of my add ons/extensions are working even when i try to redownload them?

it has been approximately four months since my add ons/extensions haven't been working and i just cannot figure out why. one day i opened firefox and each one of my add ons started to not work anymore [there was no update i might ad so lack of compatibility is out of the question also since most of my add ons are compatible with at least version 3.6] i'm running on windows vista 64bit premium home edition. yeah. please help me because this is really annoying and i cannot download any youtube videos nor music from any other website. thanks in advance
-EDL1

'''elitedarklord_1337'''
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.
'''amal123'''
See your own thread: [/questions/747509]

After having to wipe and reinstall back up, using Yosemite, I lost several email folders and add-ons, new add-ons have download "save to" window not install now

I installed Yosemite but it didn't go right, had to get Apple techs to help wipe and reinstall. Migrated apps and files from time machine backup. Thunderbird did work before things got bad enough I had to do something about Yosemite install problem.
Thunderbird lost several folders I sort mail into, and all but one extension. I tried reloading Thunderbird app support from older back up, nothing changed. I re-downloaded and installed Thunderbird. No change.
New extensions show download window with "save as" or "open with options", not the normal install button.

There may be one or more large folders in your /Volumes folder that shouldn't be there and are using up your disk space.
/Volumes is an 'invisible" folder at the root level of your internal drive which is supposed to contain only the "mount points" for your attached disk volumes, but sometimes an actual folder can mistakenly get created there, often as a result of a failed copy operation such as you experienced with SuperDuper. Such a "ghost" folder will have a name similar to a real external drive, and can contain data that was meant for the real external drive but never got there. When the real external volume then re-mounts, it can no longer use its own name for the mount point in /Volumes because that name is already "taken", and so an extra number gets appended to the mount point. This may have happened twice in your situation, since the actual drive is now mounting as "Untitled 2".
/Volumes is a hidden folder, but it's easy to peek into it. First you should *eject and then physically disconnect all external drives*. Then:
Finder>Go menu> Go to Folder
enter /Volumes and click Go
You should see an alias to the startup volume. Don't touch this, or any other aliases. Do you also see a large folder named "Untitled, and perhaps another folder named "Untitled 1," which are not aliases? If so, delete them, and restart.

Graphical errors. The Address dropdown box is blacked out, and goes normal when highlighted, tabs are blacked out, buttons are half missing etc etc. This ONLY happens in firefox, reinstalled and turn all add-ons off and it persists.

Graphical errors. The Address dropdown box is blacked out, and goes normal when highlighted, tabs are blacked out, buttons are half missing etc etc. This ONLY happens in firefox, reinstalled and turn all add-ons off and it persists.

'''''thedanbot''''':
I am not sure that your image matches '''''Apoth's''''' description as I interpret it.
Have you tried Firefox Safe Mode to see if an Add-on is causing your problem?
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]

I got update 23 and then it cks if all add ons are ok. But every time I turn firefox on it keeps recking if add ona are good. How do i stop firefox from cking??

Hello I got update 23 and when it finished and restarts it cks all my add on's and then its ready to finish updating. but this update the cking for good add ons keeps scanning each time i turn on firefox. so the 1st part of the 2 part scans ok but when it scans the 2ed part to ck add ons it does not finish and just goes away so then every time i turn on friefox it keeps doing this instead of laoding my home page firefox keeps opening up and then the firefox home page opens when i have my home page set to open up my yahoo acct. how do i get 23 update to stop scanning my 10 add ons and will then finish installing so my windows 8 laptop will get past this problem?? I hope U can tell me what to do and all my add ons are ok and my extensions are all good too!! thanks for helping me??

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end side of the Search Bar ("Find Updates" button in older Firefox versions) to check if there is a compatibility update available.
If this hasn't helped then also delete the addons.sqlite file.
You can also check for problems with preferences. 
Rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default value.
*http://kb.mozillazine.org/Preferences_not_saved
*http://kb.mozillazine.org/Resetting_preferences

Are all add-ons third party?

I am required by my new job to disable/remove all third-party add-ons. Is there a way to discern which add-ons are third party and which are not? Are all add-ons third party? Please advise. Thanks!

Extensions and Themes hosted at addons.mozill.org goes through a review process.
Toolbars are one type of extensions you may want to be more careful about and avoid any that mentions the word '''conduit''' anywhere especially or even ones that has a privacy policy.
The word Addons does not refer to just Extensions as it also groups together Themes (both complete and background images aka Personas) , Plugins, and even dictionary, language packs, search engines are included.

Which are add-ons, extensions, or plugins

There is a useless non-answer ("Add-ons are like apps") which goes on to ignore extensions and plug-ins.
What are the differences between add-ons, extensions, and plug-ins? Some use the terms interchangeably, but that is not right, since some usually show up under different window & menu lists. The Tools>Add-ons menu show all three, including Add-ons!?
Beginners or non-programmer users want to know!

Normally, when you try to install an extension from the Mozilla Add-ons site, you get a progress bar that drops down temporarily from the address bar, and then a pop-up dialog asking you to approve the installation. Do you get either of those or just nothing happens?
As an example: https://addons.mozilla.org/firefox/addon/adblock-plus/
Could you test with the avast! extension disabled in case it is blocking these normal actions? You can do that on the Add-ons page. Either:
* Ctrl+Shift+a
* "3-bar" menu button (or Tools menu) > Add-ons
In the left column, click Extensions. Then find avast! on the right side and click Disable.
Often a link will appear above a disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.
Any difference? Are other sites still a problem?

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.

I want to reinstall my operating system,How can I back up all my add ons, extensions and personas for reinstallation when Im done?

I want to reinstall my operating system,How can I back up all my add ons, extensions and personas for reinstallation when Im done?
Im using fire ftp,downthem all,wot , antiporn pro,and various personas.
I dont want to renstall them all one at a time, rather I would like to ireinstall a back up like I do with my bookmarks,
Is this possible??

See this support article. 
https://support.mozilla.com/en-US/kb/Backing+up+your+information

I have disabled all add ons and extensions to stop adverts but everytime I log into my pc the adverts appear again? not happy :(

since I updated firefox I have been HOUNDED by adverts. I read an article that suggested disabling all add ons and extensions but they seem to enable themselves again after I open my pc! I am very careful and always tick and untick boxes when I am downloading updating anything to ensure this doesn't happen therefore these add ons seem to have been automatically added by firefox during the update. not cool! the amount of adverts and the fact I have never suffered from such a pop up invasion in my life is becoming EXTREMELY annoying how do i permanently stop these adverts?

Do a malware check with some malware scanning programs on the Windows computer. 
Please scan with all programs because each program detects different malware. 
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Slow scrolling with all add-ons and extensions disabled, but OK is safe mode

I have a page for work, with a lot of links, that scrolls very slowly, with a choppy action. It is the same with all add-ons and extensions disabled. But when restarted in safe mode, the scrolling is OK.
What else does the safe mode block? Or what could be the problem.

In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.
*http://kb.mozillazine.org/Safe_mode
Try to disable hardware acceleration.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If disabling hardware acceleration works then check if there is an update available for your graphics display driver.

I updated Adobe flash and when I re-opened firefox all of my bookmarks, add-ons, extensions, history were gone. How do I retrieve?

When updated Adobe flash, I was asked to close the browser window. I complied and when I re-opened, firefox was different and all of my stuff was gone.

go to Tools Menu -> Add-ons -> Extensions section -> Disable and Remove the add-ons that look unwanted or suspicious -> Enable trustworthy add-ons -> Restart Firefox.

Why, after disabling all add-ons to correct a problem with Norton, am I unable to re-install Adobe Acrobat 10.0.0.396, even though all 7 applications in the "Containing Folder" are enabled?

mynortonaccount.com web page began coming up whenever I would go on line. Norton email support gave me steps to follow using my Firefox browser, in the safe mode, to disable all add-ons and reset user preferences to Firefox defaults.
Since then, although trying about 15 times, I have been unable to reinstall Adobe Acrobat 10.0.0.396 so that it functions.
From the "Re-initializing the plugins database" article, and progressing to the "Open Containing Folder," but unable to select File and Exit menu, I did locate "Adobe Acrobat" version 10.0.0.396
which showed all seven applications "enabled." This problem is with Firefox only. Internet Explorer functions normally.

If you want adobe acrobat pdf files to open in firefox you need an acrobat plugin, have you checked that is installed and enabled.

When I go to Tools Add-ons, nothings shows under Add-ons, Extensions, etc.

The only clickable item there is "check for updates." My add-ons are all working, but none show up. Same for Extensions, Appearance, Plugins, Services.
I don't know how long it's been this way, because I've had no need to check until last Friday, when I picked up some malware that slides open a tab from the right-hand side of my screen with "Hot Deals" on it.
Firefox's "Automatically add" option tells me that listed below are my add-ons (though I can't see them in my own Add-ons tab). There are several there I don't recognize at all, but I have no idea how I can remove them without that page properly loading.
Using Firefox 25.0.1 with Windows 7
* Google Update
* Shockwave Flash 12.0 r0
* The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
* iTunes Detector Plug-in
* 5.1.30214.0
* Picasa plugin
* NPRuntime Script Plug-in Library for Java(TM) Deploy
* Shockwave Flash 11.9 r900
* GEPlugin
* RealPlayer(tm) LiveConnect-Enabled Plug-In
* RealPlayer Download Plugin
* RealNetworks(tm) RealDownloader Chrome Background Extension Plug-In
* RealNetworks(tm) RealDownloader PepperFlashVideoShim Plug-In
* RealNetworks(tm) RealDownloader HTML5VideoShim Plug-In
* RealDownloader Plugin
* Adobe PDF Plug-In For Firefox and Netscape "9.5.5"
* Nitro PDF plugin for Firefox and Chrome
* NVIDIA 3D Vision plugin for Mozilla browsers
* NVIDIA 3D Vision Streaming plugin for Mozilla browsers
* Amazon MP3 Downloader Plugin 1.0.17
* WildTangent Games App V2 Presence Detector
* Logitech Device Detection
* RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
* RealPlayer(tm) HTML5VideoShim Plug-In
* NPWLPG
* Windows Activation Technologies Plugin for Mozilla
Thanks for any help you can offer.

If it works in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)
*If you have many extensions then first enable half of the extensions to test which half has the problem.
*Continue to divide the bad half that still has the issue until you find which one is causing it.

All add-ons / extensions are missing as if not installed. (ff4.0.1)

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