Sorry to hear that!
For firefox, you have to install it again every time you restart firefox.. Next version will be on the firefox addons website so you will be able to install it the official way and the issue should be resolved!
Can you please send me screenshots of the problems you see in Chrome about the blurry ui and the votes tab not working?
Thanks
Hey @armandocat, you are fast! I installed the new 1.1 version in both Firefox and Chrome and all seems to work. The blurry screen however ist still an issue in Chrome. Not sure if this will be visible on the screenshots. I didn't reduce the size so look at them in original size.