When adding an add-on in Firefox 7, it will download it, but never install. It disappears from my add-on list.

I'm on Windows 7 x64 with Firefox 7.
I was trying to get some new add ons from the Firefox page earlier and it was giving me some trouble. I would click the "Add to Firefox" button, the puzzle piece would pop up in the address bar and download the add on and then disappear. I can check my Add-on manager and they will show up with a download bar next to them, but will disappear after a while or when I restart Firefox.
Not sure if this is a server side problem with Mozilla or a bug in my browser. This isn't affecting any add-ons I already have installed.

You can try:
*http://blog.mozilla.com/addons/2011/09/28/issue-discovered-with-firefox-add-on-upgrades/
*http://support.mozilla.com/kb/add-ons-hidden-after-updating-firefox-7
It is possible that there is a problem with the file(s) that store the extensions registry.<br />
Delete the files extensions.* (extensions.sqlite, extensions.ini, extensions.cache, extensions.rdf) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry.<br />
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.

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