It does. It also makes Firefox consider all your add-ons invalid when it next does a signature check, removing tracking protection and any custom tab bar you h

It does. It also makes Firefox consider all your add-ons invalid when it next does a signature check, removing tracking protection and any custom tab bar you have, practically requiring you to restart the browser to continue using it as a browser. It also messes up "reopen last tab", opening something random instead, sometimes with a mangled URL. I should just modify the game's code instead but so far it has been easier to write a bash oneliner that changes the date, presses F5 on the page, and changes it back, hoping Firefox doesn't do its ~hourly sig check during that moment. Sometimes it needs an F5 while the time is set correctly because the certificate isn't valid for far-out dates. (No idea why it works other times, it really shouldn't.)