A BUG? Noté 5 sur 5 étoiles

It‘s a good extension and I have used it for a year.But recently I used it in a new laptop and find a problem in some pages monitored.when the page changed,the changed text is yellowed well,but the changed page is not alerted and overstriked at all,though the latest changed is colored....

How can I fix it?or am I set the extension wrong?Need a help,thank you very much!

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