EDIT: Wow, a downvote despite providing concrete feedback to the submitter? Interesting. I might have to re-think my entire position about the HN "community" as expressed here: http://news.ycombinator.com/item?id=2660578
It's like driving your Prius to watch a rally race. Works great.
The fast, whizzy machines with new OSs and up-to-date browsers get used for serious, work-related stuff. Not for HN.
Would also love the ability to specifically blacklist keywords.
Other than that awesome work, thanks.
To let you know, I wanted to build the simplest thing that could possibly work at first, but everything is feasible in the future. Blacklists, better browser support (I've tested it only on the newest of the five most used, sorry about that), and to provide more options.
I'll work on all that as soon as my college exams are over.
Edit: You might also consider clearing the text box after adding a tag. It felt a bit awkward having to hit ctrl-a before typing each time I wanted to enter something new.
Subject filter (filter Ask HN)
User criteria - 'always on' or 'always filter' by user (always show from rmontanaro/never show from cyanbane)
show/filter x levels of comments (ie show 'bitcoin' unless there are 4+ levels of comments at some point)
I hope you won't mind me using this concept for my next app creations.