in Firefox Focus, there is an option to close other tabs when you access the tab list. my only problem with this feature is that it's placed inside of the tab list, which has lead to me accidentally clearing other tabs -- something that isn't very welcome in a browser where I can open them back up again.
the best solutions I can think of are an option in settings to disable the button and/or an option to add a confirmation when tapping it.
also just want to extend a little thank you to the Firefox focus team! setting it as my default browser basically cured my internet browser screentime and I'm very grateful for the app!