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Firefox crashes every time MacBook sleeps. Also, there is no Firefox application in the Apple store. This is not user friendly.
Why is this Apple's fault?

I'm a firefox user myself, but the lack of a firefox in the app store is not an apple choice/problem its Firefox. If its crashing, that's on firefox.

Developers have access to the beta and its on them to update their apps
 
I run Firefox Nightly (the most "bleeding-edge" betas), and have for years. Currently on today's Tahoe beta (26.3 beta 1) and as usual Firefox runs fine without any crashes.

As p33t3r says, it could be an extension. Do a "safe" restart:

Go to about: profiles (without the space, as MacRumors stupidly converts to an emoji otherwise) and click the reboot without add-ons option.
 
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I run Firefox Nightly (the most "bleeding-edge" betas), and have for years. Currently on today's Tahoe beta (26.3 beta 1) and as usual Firefox runs fine without any crashes.

As p33t3r says, it could be an extension. Do a "safe" restart:

Go to about: profiles (without the space, as MacRumors stupidly converts to an emoji otherwise) and click the reboot without add-ons option.
what a great thing to do for someone! BLESS YOU!!
 
Firefox has many bugs on macOS. I believe that's on the developer, not Apple. For instance, a long-standing bug I experience is that Firefox doesn't respect Spaces (or virtual desktops). I want to keep a Firefox window in Desktop 1 and in Desktop 2. When I swipe on trackpad, Firefox keeps the window from Desktop 1 on top.
 
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I running sequoia no issues with Firefox or opera no extensions on either, for whatever reasons safari is blocked by some sites as having an adblocker when one isn't used, go figure
 
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FF (with many extensions) is the default browser on my M3 MBP running Sequoia 15.7.3 and on a 2012 MBP now dead. Never had the crash on sleep issue. Agree that it might be an extension conflict - have had those in the distant past on Windows machines.
 
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Firefox has many bugs on macOS. I believe that's on the developer, not Apple. For instance, a long-standing bug I experience is that Firefox doesn't respect Spaces (or virtual desktops). I want to keep a Firefox window in Desktop 1 and in Desktop 2. When I swipe on trackpad, Firefox keeps the window from Desktop 1 on top.
This is odd. I can have FF windows in multiple spaces so long as I select 'None' in the FF Options Assign-to context menu. Right-click on the FF icon -> Options -> None (last choice under Assign-to)
 
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