Common Firefox Issues Over Its History
Browser crashes and freezes.
Memory usage problems.
Extension compatibility issues.
Website rendering bugs.
Security vulnerabilitie… (read more)
Common Firefox Issues Over Its History
Browser crashes and freezes.
Memory usage problems.
Extension compatibility issues.
Website rendering bugs.
Security vulnerabilities that required updates.
Performance slowdowns on older hardware.
Compatibility problems after operating-system updates.
Support ending for older operating systems.
What the Message Means
If you're running:
macOS 10.14 Mojave
macOS 10.13 High Sierra
macOS 10.12 Sierra
or older,.Firefox 115 is the last major Firefox version that supports macOS 10.12 (Sierra), 10.13 (High Sierra), and 10.14 (Mojave).
Users on those macOS versions are moved to Firefox ESR (Extended Support Release).
Mozilla plans to provide security updates for Firefox 115 ESR until at least the end of August 2026.
After that, support may end unless Mozilla extends it again.
Apple stopped providing security updates for macOS 10.14 in 2021, which is one reason Mozilla is ending support.
To receive the newest Firefox features, Mozilla recommends upgrading to macOS 10.15 Catalina or newer.
So if you're using macOS 10.12, 10.13, or 10.14 and seeing:
"Firefox is no longer supported on macOS 10.14 and below."Firefox has had many bugs, crashes, performance issues, extension compatibility problems, security vulnerabilities, and website compatibility issues over its long history.
ChatGPT and other online services have also experienced outages, slowdowns, login issues, and software bugs from time to time.
No software product has a complete public list of every glitch ever discovered because there have been thousands over the years.Firefox, since its first release in 2004, has experienced thousands of reported bugs, including crashes, memory leaks, slow performance, security vulnerabilities, website rendering problems, and extension compatibility issues.
Major changes—such as the transition to the Quantum engine in 2017 and the introduction of the WebExtensions system—fixed many problems but also created temporary compatibility issues for some users.
Security researchers and Mozilla have continuously discovered and patched vulnerabilities over the years.ChatGPT and other online services have experienced service interruptions, heavy-load slowdowns, login failures, missing chat history incidents, API outages, and software bugs.
Large cloud services operated by many companies occasionally suffer outages due to server failures, network problems, software deployment errors, configuration mistakes, or unusually high traffic. Helpful Tip!
Follow through. Sometimes, our volunteers would ask you for more information or to test out certain scenarios. The sooner you can do this, the sooner they would know how to fix it. macOS 10.15 Catalina and newer: you can run current Firefox releases.You'll still receive ESR security updates while Mozilla supports Firefox won't open.
Firefox opens and then closes unexpectedly.
Firefox freezes and stops responding.
Firefox runs very slowly.
Web pages take a long time to load.
Some websites do not load at all.
Tabs crash unexpectedly.
Videos do not play properly.
Audio does not work correctly.
Extensions or add-ons stop working.
Pages appear blank or partially loaded.
Text, images, or graphics display incorrectly.
Scrolling is slow or jerky.
Firefox uses a lot of memory.
Firefox shows error messages.
Downloads fail.
Login pages do not work correctly.
Certain buttons or menus do not respond.
Firefox repeatedly asks to be updated.
Firefox reports that your version of macOS is no longer supported.