Need help with add on for firefox quantum, want to press a button have script read URL and then if any changes to url occur revert back to saved url or even better simply disable the ability for the site to change to any other page until i press the button again... a 'lock url' button next to the ad block plus button.

Also, i want a script to read the text at the top of every tab/window and if the text ever reads 'redirect' i want it to revert to homepage.