You are forced to used #Facebook on your #Android phone? You don't want to use the official apps because they are even more poison for your #privacy? And you don't want to open the browser every time?

Try "Tinfoil". It's a wrapper with sandbox functions for the Facebook mobile site, is available on F-Froid and Google Play and is free software. Only disadvantage: It has no push notifications and in future it might add non-free plugins. But hey - still better than the original app ;)