A: Yes – Firefox Sync works on 78 ESR (sign in with a Mozilla account). Conclusion Searching for “firefox download for mac 10105 upd” is a smart move if you’re keeping a classic Mac alive. The final, secure, and usable version is Firefox 78.15.0esr . While you won’t receive modern updates beyond that, following this guide ensures you have the most functional browser available for macOS Yosemite 10.10.5.
Thus, effectively means: Get the latest Firefox 78.x ESR update. 2. Why You Still Need Firefox on macOS 10.10.5 Safari on Yosemite is outdated – many modern websites (banking, streaming, cloud apps) break. Chrome dropped support for 10.10.5 years ago. Firefox ESR remains the only modern, secure browser for these legacy Macs (MacBook Air 2011, Mac mini 2012, iMac Late 2009, etc.). firefox download for mac 10105 upd
A: Use curl in Terminal: curl -O https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/Firefox%2078.15.0esr.dmg A: Yes – Firefox Sync works on 78