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Multiple "Install Add-on" tabs for the same updates keep popping up. Why?
Several times a day when I start Firefox I get several tabs asking me to update apps that have already been updated. LastPass 3.3.1 for instance which is the installed version. How do I make it stop doing this?
Running W7 btw.
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It is possible that there is a problem with the file(s) that store the extensions registry.
Type about:support in the address bar and press enter.
Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.
Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.
After, restart Firefox.
See "Corrupt extension files":
You will have to approve the updating one last time.