Some sites prevents users to save images like Instagram on posts but actually we downloaded those images and we should be free to save that images without downloading any add-on to re download it.
Some apps like Psiphon 3 try to open their links and we should be able to deny or allow them to be opened in Firefox each time.some apps open their links after uninstalling their apps and some apps may want to open harmful links.
Yes we need this, I want to install Google translate and Instagram down loader add-ons but I have to give all information of My Firefox Data to Google and Instagram and add-on makers to be able to use these add-ons.