In Firefox Nightly (npub1q6s…03km) (not just nightly! ANY Firefox 141 or higher:
1. Type "about:config" in the address bar
2. Accept the warning (if applicable)
3. Search for "browser.ml.enable"
4. Set it to "false" (double click it)
5. Search for "browser.ml.chat"
6. Set "browser.ml.chat.enable" to false
7. Adjust other values, such as the menu, badges, prompts values
8. Use FirefoxDevTools (npub1rsa…gq8a) the way the flying spaghetti monster intended it, without a stupid #AI