Firefox desktop has the functionality to have extensions pinned to toolbar for easy access on tabs and homepage. A similar functionality can be implemented in the android version. With the current Firefox android version, there already is an option to add a button to tab bar. Given the limited space on the bar, the choice of extension can be limited to one. Moreover, one needs to open a webpage to change extension value. It would be better if it can be managed/toggled through the homepage through the tab bar button.
As an example, one can add a proxy toggle button to tab bar without having to open a webpage and then toggle the extension from the settings menu.