I was able to install Firefox by installing flatpak. The problem with the Deepin both this version and version 15 is it have a lot of non english language stuff. Deepin desktop on Arch should be good once it gets in the repo. I’m just playing around with it on v-box.
Edit: I don’t know about the font on here though on the actual site here not Firefox.
Edit: I will say it works but not correctly. If i dock it then it won’t open from the dock and i i launch it from the start menu or launcher it puts another icon beside the one on the dock and is different icon. So something isn’t right. Not even sure flatpak is correct.