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Firefox stops working when I use Quilbot Grammar Checker

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I get a message saying that the Quilbot site is slowing Firefox down. then all I can do is to turn the computer off altogether. Nothing else works. Not Alt Ctr Dlt to get to Task Manager even.

I get a message saying that the Quilbot site is slowing Firefox down. then all I can do is to turn the computer off altogether. Nothing else works. Not Alt Ctr Dlt to get to Task Manager even.

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Quillbot is not a spellchecker per se , it is a grammar correction tool.

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Thanks. It would be nice to know what it is though. Did try a different Grammar checker and that had the same effect.