Wind XP, FF17.0.1 Thee Add-on manager will not load anything, "loading" wheel just spins.

If I go to the Add-on website and I try to install one, like the indispensable Adblock Plus, it will start, and the progress bar will reach the end but it won't finish the process. It just stays there indefinitely and retrying the download will have no success.
I am in my seventies and as you can imagine I'm not terribly quick, terminology-wise etc. ;-)
Thanks for your understanding and help。
Onkobo

hello onkobo, this sounds like the files in your [[Profiles|profile folder]] that store the information about your extensions might have become messed up somehow.
please go to firefox > help > troubleshooting information > profile - show folder... then windows explorer should open up your profile folder. in there look for the files named extensions.ini, extensions.sqlite, extensions.sqlite-journal (and in some cases also extensions.txt, extensions.rdf). delete those files and quit firefox, they will be regenerated the next time you launch firefox.
also see [https://support.mozilla.org/en-US/kb/Unable%20to%20install%20add-ons#w_corrupt-extension-files]

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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.

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.

Tools/Add-ons, then the page will not 'load' symbel just keeps going round

the Add-ons page will not load, it just goes round a long long time and will not open,
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By default the "Get Add-ons" tab is selected if you open the about:addons page (Firefox/Tools > Add-ons) 
That page tries to load content from the Mozilla server and that can take some time especially if the Mozilla servers are busy. 
You can click on the Extensions tab to see the installed extensions or one of the other tabs to see other installed add-ons.

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.

The last week, Firefox will not load up the NEW YORK TIMES. So, I have had to use Safari to do so. If this continues, I'm going to quit using your browser, and begin using Safari all the time!

The last week, Firefox will not load up the NEW YORK TIMES. So, I have had to use Safari to do so. If this continues, I'm going to quit using your browser, and begin using Safari all the time!

There are several other similar posts in this forum with the answers. Your post appears third in my Google search today looking for a solution so I thought I'd add the solution here as well.
It is obviously a bug in either (or both) Firefox and the NYT.
The quickest solution is to simply go to the VIEW Menu in Firefox, then the ZOOM option and choose RESET.
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'''Except 8.0.x version also supported version is 3.6.24 '''you can find it here:
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check the system requirements:
http://www.mozilla.org/en-US/firefox/3.6.24/system-requirements/
see also:
[https://support.mozilla.com/en-US/kb/Installing%20a%20previous%20version%20of%20Firefox Installing a previous version of Firefox]
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