Facebook in app's browser is total horror and I refuse to do any work related to it, even if it would cost me my job! A while ago I made a website for the comp

Facebook in app's browser is total horror and I refuse to do any work related to it, even if it would cost me my job! A while ago I made a website for the company I work for, everything was working flawless across all major browsers including mobile. Then some e-commerce dude asked me to fix a few style issues for Facebook browser. I didn't even know of it's existence by then! This browser goes way beyond IE6 incompatibility, I spend 2 days in hell trying to fix the style issues, which is nearly impossible because there is not even a proper way to test your changes. To start I first had to install that stupid FB app/virus in my phone, after that everything you type in the address bar generates some totally useless crap suggestions and advertising all the way, it was quite a puzzle/hack to even reach my own development server through all this misery.. I eventually had to decide to redo the entire styling of the website so it works with FB browser, or simply give up. I very fortunately managed to convince my manager to not support FB browser, but I must have lost some credibility that I was not able to fix this seemingly simple style issue.