This is a topic for all MacOS/OS X versions from 10.10 to 10.15
This includes:
*Prototypes of MacOS/OS X 10.10 to 10.15
*OS X Yosemite (10.10)
*OS X/macOS El Capitan (10.11)
*macOS Sierra (10.12)
*macOS High Sierra (10.13)
*macOS Mojave (10.14)
*macOS Catalina (10.15)

Reserved

Useful Tools
Software
Notes:
Apps that work on previous macOS versions may also work here. Note that 32-bit applications are no longer supported by macOS 10.15 (Catalina) or above.
Browsers
*Firefox: officially supports macOS Catalina and above
*Chrome last supported: 128 (Catalina), 116 (High Sierra and Mojave), 103 (El Capitan and Sierra), and 87 (Yosemite)

Reserved

Reserved

Bringing this topic up

https://scratch.mit.edu/discuss/post/9026009/
Read (for anyone using macOS 10.12 to 10.14 and Firefox 115 ESR)
Edit:

medians wrote:

Omg wait they just extended it again XD (firefox 115)

lol
Geckium's devs seem to have thought so too bc they had a discontinuation message until now

BTW, I've confirmed that the takedown was what I expected
Hopefully someone can revive dynasty

Bringing this topic up.

Someone has revived firefox-dynasty. The browser is currently based on 140 ESR (posted in the OS X/Mac OS X (10.0 to 10.9) topic as well)

Honestly this is my favorite era of macOS (besides the early OS X days)

medians wrote:

Scratch Desktop has ended support for macOS Big Sur

This also includes 10.13 to 10.15