Firefox Community Forum

The operating system on my iMac is still the same version as when I bought it about 10 years ago: macOS High Sierra Version 10.13.6. Since I recently downloaded the latest version of Firefox, left mouse clicks no longer work in Substack pages. How can I download and install a version of Firefox that will go back to working for me the way it used to? I'd rather not update to a later version of the macOS operating system. I suppose I can if I absolutely have to, but I haven't been able to figure out how to do that either.

I'm running mac os 10.13.6 and have installed Firefox 118.38 ERS but some websites are not allowing me to proceed due to my system being outdated/unsupported, what can I do about it? Cheers in advance for any pointers.

When I open my Gmail I see the following message: “This browser version is no longer supported. Please upgrade to a supported browser.”

So I Downloaded Firefox ESR as suggested by Google and then I moved the Firefox app into my applications folder, but then got the message that "a newer version already exists, do I want to replace it with the older one I’m moving? Or keep both", so I kept both.

However when I go to my application folder I only see one Firefox icon and when I opened my Gmail again I still see that message “This browser version is no longer supported. Please upgrade to a supported browser.”

I also see that Google is saying that Firefox doesn’t support “offline access to Gmail” what does this mean?

Is this 115.32 still in effect for my macOS 10.13 ? Or is it xld as it would be in Feb 2026?

Did or does Firefox 115.32 afford my apple macOS 10.13 enough security until I purchase a new computed.. How much more time do I have.