Then the malware isn't a browser plugin (it won't be fixed by removing all extensions and reinstalling the browser), it's something on your actual computer.
At the very worst, it's on your network.
But it's far more likely that it's on your computer.
I'm going to assume Windows. You need to run anti-virus if you have it and/or any malware scanner such as Windows Defender.
Then the malware isn't a browser plugin (it won't be fixed by removing all extensions and reinstalling the browser), it's something on your actual computer.
At the very worst, it's on your network.
But it's far more likely that it's on your computer.
I'm going to assume Windows. You need to run anti-virus if you have it and/or any malware scanner such as Windows Defender.