Add ons manager hangs after doing a Windows 7 System Restore.

Firefox was restored from Version 23 back to Version 20. Now, none of my Extensions or PlugIns show up and when I click on "Get Add Ons" I just get a"Loading" and it hangs. I tried deleting the extension.ini and extensions.sqlite files and restarting Firefox but that did not work. It seems like the add ons and extensions are there, but just not accessible through the Add On Manager.

Note that using System Restore can cause your Firefox installation to get corrupted because not all files are restored (only files in a white-list), so be cautious with using System Restore.
*You may lose data in the Firefox profile folder like .js and .ini files.
*You may need to (re)install software that was affected.
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 23.0: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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After Firefox 6 upgrade, Add-ons Manager does not load, it just says "loading" forever

nothing to add

Thanks for the suggestions. When you click on Tools and then Add-ons, theAdd-on Manager launches, and by default "Get Add Ons" is selected. Although I was not getting any response other than "Loading", if I then click on Extensions or Appearance or Plugins, I was getting a proper response from those three. After doing that and closing out Add-ons Manager and then relaunching it, my original problem disappeared. Now everything works fine. I tested it multiple times and is still OK. Can't explain it but OK for now. Maybe the Get Add-ons portion of the Web site was down at the times I was testing it? I'll keep a watch on it. Thanks for your speedy reply.

Why does Firefox add-ons manager install old version of LastPass?

After using Chrome in MS Windows for four years I have recently been considering a return to Firefox as my primary web browser.
After installing Firefox v26.0 my first requirement was to get the LastPass add-on, which I did via Firefox's "Add-Ons Manager". I signed in to my LastPass account and all should now have been well.
Not quite. Whenever I launched Firefox and logged in to LastPass, Firefox would hang for about a minute. The same occurred when I updated or created a LastPass record.
Then I checked the version of the LastPass plug-in: 2.0.20, built 2013-02-08. That's from eleven months ago!
I tried the update feature on the LastPass add-on menu, but it did nothing, so I went to LastPass.com and downloaded the latest version (3.0.12, built 2013-12-03). After a restart all was indeed well.
I had the exact same experience with Firefox on Linux, by the way.
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Whoever is at fault, it must be corrected and soon. I very nearly gave up on my switch back to Firefox because of this. I'm sure others will have had the same experience.

hello Jesse_Penny, thanks for your insight - according to [https://blog.mozilla.org/addons/2014/01/08/add-ons-update-42/ public information] from mozilla's addons team, reviews for updated addons at addons.mozilla.org currently take around 5 days - so i don't know if this would warrant pulling out of AMO, which causes the issues the question owner has described...

Updating Flash Player Does Not Reflect In Add-Ons Manager or Plug-In Check

The add-ons Manager shows I have Flashplayer version 11.3.300.265. The Plug-ins Check shows there is an update, and I downloaded and installed Flash Player version 11.3.300.268. Six times! Each time, the installation shows as successful on the Adobe site, but FF14 does not reflect the new version, and the Plug-in check continues to insist that the version is out of date.
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In addition, the add-ons manager shows a version of Flash 9.0.45.0, last updated Feb 20, 2007. There's a big red warning that it's out of date. This is in addition to Shockwave Flash (the correct one) and Shockwave for Director (which is current). It's been like this for awhile, and I disabled the antique version of Flash and it does not affect FF or Flashplayer performance.
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Such old version are usually located in the plugins folder in the Firefox program folder (C:\Program Files\Mozilla Firefox\).
You can enable the plugin and verify the path on the about:plugins page.
You can set the plugin.expose_full_path pref to true on the about:config page to see the full path of plugins on the about:plugins page.
*http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins
*http://kb.mozillazine.org/about:plugins
*http://kb.mozillazine.org/about:config
It is best not to leave that pref set to true as it exposes that full path to web servers, so reset that pref to false after you are done with the about:plugins page.
See "Manually uninstalling a plugin":
*https://support.mozilla.org/kb/Troubleshooting+plugins

Why does add-ons Manager create a new tab every time I go to home page?

When I start Firefox my home page tab shows up along with an add-ons Manager tab and a plus sign for new tab. Every time I go to a web site and then return to my home page ANOTHER add-ons Manager tab shows up. This apparently will go on forever. I have had as many as 20 add-ons Manager tabs showing. The only way to eliminate them is to stop Firefox and then restart. Then it starts all over again. What is causing this?
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Please help.

Can you post back here a screenshot from this issue?

Firefox 10 Add-Ons Manager does not open in a tab

In later versions of Firefox 9 and now Firefox 10, the "Add-Ons Manager" refuses to open in a tab. Instead, it opens as a window with no border that will not move and cannot be moved or closed except by closing it from the Start Bar at the bottom of the screen.
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updates 9 and 10 have caused me problems as well with add ons and the extra tab appearing welcoming me to firefox.
With update 10 all my add ons disappeared.. upon going to tools /add ons I found half my add ons were incompatable and the others were closed! I just opened them again and all was fine. Luckily the add ons I use often were still compatable.
The other option is to just add them again if they are compatible.. if not you can get around it by googling and comming up with a solution there somewhere.. One I use a lot is download helper and I had to do this about 3 versions ago to get it running.
There could be a solution in Help/trouble shooting and looking at extensions.. your add ons should be listed there and all be True..
If not you will most probably have to open Containing folder in top block and do something there.. Not sure what but will leave it up to the experts..
Seriously it would most probably be quicker to reinstal you add ons.

Why does the Add-ons manager take an excessive time to load and can I view my add-ons without going to the add-ons manager?

When I start my browser up my everything that I have been working on comes up without any problem and I can open a new tab to go to another site without a problem, but when I go to the Add-ons Manager it can take over 3 minutes to load and that's if I don't stop it. My other question is can I view my add-ons, plugins, etc without having to open the Add-ons Manager?

Check out this similar thread: [https://support.mozilla.com/en-US/questions/836711 Some websites, Mozilla included, appear to think I'm using a different version of Firefox from the one I am using; how can I fix this? | Firefox Support Forum]. Does that help?

After updating Firefox to 5.0.1 the add-ons Manager did not show any of my add-ons, although they were all running.

After updating Firefox to 5.0.1 the add-ons Manager did not show any of my add-ons, although they were all running. Several restarts of Firefox, even with the add-ons disabled did not bring them back. I then installed another add-on and after restarting, all of the previous add-ons are now shown in the manager.
Running on Mac 10.5.8. Add-ons installed:
Adblock Plus, Add-on Compatibility reporter, Ant Video Downloader, Forecastfox, Google toolbar, Reload Every, Session Manager, and Steep and Cheap Watcher.
Note: the troubleshooting information was taken after the problem was fixed. Prior to fixing the issue, there were no items under the Extensions heading. Add-on Compatibility Reporter was the add-on that was added to restore all of the other add-ons, even though it was already installed.

'''Good to know you solved your own problem by simply installing another extension''', I like solutions that aren't going to cause extra work, or loss of data.
Here is what people normally have to do for missing extensions, as if not installed.-- https://support.mozilla.com/questions/826729
:http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_%28Firefox%29
FWIW, renaming or deleting extensions.sqlite and the other files beginning with "extensions." causes the files to be rebuilt from the extensions directory, so nothing is lost, but they will be restored in alphabetical order.
I've solved places.sqlite problems by simply restoring a bookmarks backup, or creating a bookmarks backup and restoring that rather than face loss of history.
Please mark as solved so others will see your answer when looking for solved problems as solutions to there own or other people's problems.

After automaticly updated to the version 7 the extensions page in the Add-ons Manager went blank and give this sentence "you don't have any add-ons of this type installed" but all the add-ons still working in the program

All the add-ons I had installed for the version 3+++ still working at the version 7, but the problem is that the extensions page in the add-ons manager is blank except a sentence that says "You don't have any add-ons of this type installed"

https://support.mozilla.com/en-US/questions/826729 has a solution for the problem

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No one here is going to do anything about it. Send feedback to Apple.
http://www.apple.com/feedback/ipad.html
Basic troubleshooting steps.
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 

The Add-ons Manager will not display!

I've been having an intermittent problem with certain features not displaying at all. First it was that I could not "Customize" my toolbar for quite a while. It finally returned suddenly, in FF v4.01, after being unavailable since v3.5.
I've also been without the Magnifying Glass search icon since v3.5, which is still missing. And the show "Properties" option has also disappeared from the Right-Click Context menu, I don't remember if it started in FF v3.x , but I think it was right after upgrading to v4, and it hasn't returned since either.
Now it's the Add-ons Manager that has quit working. It has happened a few times before, but quitting and restarting Firefox brought it back.
This time, however, it seems to be completely disabled. I had just removed the IE Tab Plus extension, to be sure I hadn't installed it over the original IE Tab, which they said could cause unpredictable issues.
Next I used "Install Extensions" from the File menu of the Add-ons Manager tab, and selected a copy of IE Tab Plus I had saved to disk last October 2010 to re-install it. But nothing seemed to happen. No pop-up, or any indication/notification that an extension was about to be installed - nothing.
So I did a search for IE Tab Plus to acquire the latest version from it's Mozilla Add-ons page, where I noticed a "Comment" claiming the IE Tab Plus author was using it to secretly install Ad-ware, and recommended using IE Tab 2 instead.
I decided to do as suggested, but there is no link on the page to install IE Tab 2 from either. I decided to quit and reload Firefox, yet even in Safe Mode, I still can not get the Add-ons Manager Tab to load.
Note:
I also have Mr. Tech's cool Toolkit extension, which I believe added the "Extension Options" item to the Tools menu, and it is also empty now. It was not empty just before this. In fact it still displayed my extensions list after the Add-ons Manager had already failed to load again at all.

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
This can 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 Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.

Foxfire 6.0 add-ons manager not working, says "loading", get nothing, now what?

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Thanks for the suggestions. When you click on Tools and then Add-ons, theAdd-on Manager launches, and by default "Get Add Ons" is selected. Although I was not getting any response other than "Loading", if I then click on Extensions or Appearance or Plugins, I was getting a proper response from those three. After doing that and closing out Add-ons Manager and then relaunching it, my original problem disappeared. Now everything works fine. I tested it multiple times and is still OK. Can't explain it but OK for now. Maybe the Get Add-ons portion of the Web site was down at the times I was testing it? I'll keep a watch on it. Thanks for your speedy reply.

Is Shockwave Flash 16.0.0.305 which is shown in the list of plugins in Add-ons Manager insecure

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Hi, that is the [https://www.adobe.com/software/flash/about/ latest version!]
''If you receive a satisfactory answer, please help others having a similar problem, by marking it as 'Solved.'''

Why can't I access extensions thru Add-ons Manager?

I just upgraded to version 8 on WinXP. Flagfox extension died on start up, so I tried to uninstall and re-install as suggested. However, Add-ons Manager says I have no Extensions, but Tools Menu lets me access and configure a number of extensions.

Well, after restarting Firefox enough times, everything seems to have gone back to normal. I even have extensions listed in the Add-ons Manager. I guess I have a successful upgrade to version 8, but it wasn't a pleasant experience.

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I just tried a manual Addons -> Extensions update and got an update for [https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/ Adblock Plus]. When I checked Recent Updates, The release notes were accessible (see attached).
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Add ons manager hangs after doing a Windows 7 System Restore.

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