Could you check a couple things: (1) Suspicious extensions Try disabling ALL nonessential or unrecognized extensions on the Add-ons page. Either: * Cmd+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. Then, if in doubt, disable (or remove). ''Bear in mind that all extensions are optional; none are included with Firefox.'' Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step. (2) Home page setting These articles describe where in Preferences you can restore your preferred home page: * [[Startup, home page, tabs, and download settings]] * [[How to set the home page]] If your change is undone when you quit Firefox and start it up again, the problem might be a user.js file in your settings folder. This article has tips on tracking down and removing it: [[How to fix preferences that won't save]]. ---- Does that work, and/or does anything else need to be fixed?