Display highest scoring submission instead of last

[kiritofeng]

Firstly, thanks for creating this project - it's made using Marmoset a lot more bearable 😛

I've found that the extension will display your last submission made, rather than your highest scoring submission. While I do not know if all classes take your highest submission as your grade for the assignment, the one I am currently taking does, so it would be nice if there was an option to toggle between displaying the highest scoring submission instead of the last one.

[lishid]

Hey~ I'm surprised this is still being used considering the code is more than 7 years old!!

Either way - feel free to make any changes and send a pull request over so we can have it merged.

(We the original makers have graduated long ago and don't actually have access to Marmoset anymore)