Disable and remove your Extension Take Webpage Screenshots Entirely - FireShot 0.98.94.7 ({0b457cAA-602d-484a-8fe7-c1d894a011ba}) Thanks for having send info on. That was easy to figure out. Firefox 57 has a built in screen shot in the Address Bar the 3 dots ... click. This is what comes next though... https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware use more than 1 scanner as each uses diff tech. Save the Reports. If doing this yourself Google each item found as do not want to disable something you want. If need help https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/ Please let us know if this solved your issue or if need further assistance.