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Impossible to install Checker Plus for gmail

Hello Impossible to install Checker Plus for gmail on firefox, I have this message : Try re installing the extension. Error UnknownError the operation failed for reasons unrelated to the database itself and not covered by any other error code. the extension appears to firefox, but does not work and every time I open firefox I have this error message in the notification window at the bottom right I tried several times to re-installed but impossible. Please help me


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