Fire fix usage went from I forget what but really significant down to the level people don't build site for it anymore.
Pretty sure it's because they made security changes that broke the Intranet.
What you want una browser is that it t works. Not some security pop-up telling it doesn't work. Especially if you wrote the website.
Still annoying evert time https://127.0.0.1 is flagged as insecure
#6 in hacker news ChatGPT images announcement doesn't work in Firefox Android as a perfect example.
https://openai.com/index/new-chatgpt-images-is-here/