Hi, it mean you need to do a Malware scan. Version 57 is not supported. Current version is 61.0.2 Please update your way out of the problem as well as missing critical security patches included in the updates : *https://www.mozilla.org/firefox/all/ Please let us know if this solved your issue or if need further assistance.

I've been trying 61 and so far it's working, although not perfect. It seems to do everything I want. I might not always use the latest because in the future it might not do all I want. If 61 didn't then I'd want to know what was wrong with 57.

Well for one 57 was the 1st of Quantum and had bugs, which where fixed in later releases and improvements made since and security. When it came out Accessibility Services was on by default which caused issues like you had as well it was a security risk being left on. As well there was no security for : *https://www.theinquirer.net/inquirer/news/3023893/opera-mozilla-vivaldi-and-more-rush-to-patch-spectre-and-meltdown-security-holes *https://money.cnn.com/2018/01/04/technology/spectre-meltdown-cpu-flaws-explainer/index.html Releases comes out you can check each new feature & security for it here *https://www.mozilla.org/en-US/firefox/releases/ If have issues again can check through this : '''''To be Checked and turned off unless needed for accessibility : ''''' Please : go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check (put a tick in the box) the setting to Prevent Accessibility Services from accessing your browser. '''''Multi-Processor Support : ''''' Go to the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please. Note : Hardware Acceleration is for Video Card, Monitor to see if remain off or to turn back on. Only Disable as last resort. '''''Multi-processor Can completely disable it this way in about:config :''''' dom.ipc.processCount set to 1 browser.tabs.remote.autostart = false browser.tabs.remote.autostart.2 = false *http://kb.mozillazine.org/About:config Only move to esr if low ram and old system. '''''Firefox Extended Release Version :''''' Firefox ESR does not come with the latest features but it has the latest security and stability fixes. *https://support.mozilla.org/en-US/kb/switch-to-firefox-extended-support-release-esr If do please : *https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles *https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer