What’s with my Firefox icon?

When i open Firefox, the background in the icon around the bottom of my filter turns green on the left aspect.(I’m operating Windows 6.) For the moment, I’m implementing Google Chrome.We have run the anti-virus along with anti-maleware, but nothing bad continues to be detected.Any suggestions, besides removing and re-downloading Firefox

it may well be downloading some thing.

verify the downloads.

instead of uninstalling that.

choose the AppData > Roaming folder as well as delete the mozilla folder
a fresh one will probably be written if you restart firefox.

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