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Unable to load wikibuy ext. since firefox refresh. Says corrupt. Why? Worked fine before refresh.

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Unable to load wikibuy ext. since firefox refresh. Says corrupt. Why? Worked fine before refresh.

Unable to load wikibuy ext. since firefox refresh. Says corrupt. Why? Worked fine before refresh.

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Where are you trying to install from? The Wikibuy extension appears to be gone from the Mozilla Add-ons site:

https://addons.mozilla.org/firefox/addon/wikibuy-for-firefox/