I think you have this problem on your Mac, and not on an iOS device (iPhone, iPad). A moderator can move your question over to the regular Firefox forum. Meanwhile, where does Search marquis show up in your Firefox? For example: * Replaces your normal startup (Home) page * Replaces your new tab page * Takes over as your search engine for searches submitted through the address bar * Other places ---- One possible culprit would be an extension. You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either: * Command+Shift+a (Windows: Ctrl+Shift+a) * "3-bar" menu button (or Tools menu) > Add-ons * type or paste '''about:addons''' in the address bar and press Enter/Return In the left column of the Add-ons page, click Extensions. On the right side, find the "Manage Your Extensions" heading. ''If there is at least one extension before the next heading -- "Recommended Extensions" -- please continue:'' Then cast a critical eye over the list below that heading. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything suspicious or that you just do not remember installing or why? If in doubt, disable (or remove). For your privacy and security, don't let mystery programs linger here. You might still need to clean up some settings after that: * [[How to set the home page]] * [[Change your default search settings in Firefox]]