If Firefox 78 does not meet your needs, some users on legacy macOS versions look toward community-maintained browsers like Pale Moon or SeaMonkey , though compatibility varies.
Your current browser may have malware or an old search engine hijacker. Install fresh Firefox 78.15 and run a scan with Malwarebytes for Mac (compatible version 4.17). firefox download for mac 10105 upd
Before you begin, ensure your Mac meets the system requirements for Firefox: If Firefox 78 does not meet your needs,