Hi, I’m a student at Coventry University and currently studying Open Source Development, for an assignment I received a question to identify a known bug from the open source software, and since I am doing research on firefox and new to open source studies; could anyone help me to identify any known bug in firefox?? thank you in advance 
thank you, for your help!
Some bugs are marked as “good-first-bug” and has a mentor assigned so those can be a good place to start, for example: