Have tried to download Stumbleupon as an extension to Mozilla Firefox but unable to do so as get response that it is not a valid install package when attempting it. Any ideas as to how I can download it
This sometimes happens if you profile folder gets corrupted, if you go tho this Mozilla site click here and scoll down to "What do I do if my profile's corrupted?" all the instructions are on that site on the location of the profile folder.
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