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Hi, I did some tests. When I first install Checker Plus for Gmail, I got this error message "Problem starting extension. Try re-installing the extension. Error: Unknown Error. The operation failed for reasons unrelated to the database itself and not covered by any other error code". I clicked this message and it opened a page to ask me to Refressh Firefox. I did it, refresh my Firefox, then reinstall Checker Plus for Gmail, it worked. I login my Gmail account, this extension worked fine, reminder me new email was received. I ran Wise Care 365 to Checkup and Fix, then reopen Firefox, Checker Plus for Gmail still worked fine. I also did Common Cleaner, Registry Cleaner, Advanced Cleaner, but Checker Plus for Gmail worked fine.

The product looks promising! But the program does not show my upload/download speed.