There are more and more users with a Screen resolution higher than 3000xY so Lightweight themes don’t really look good on there Firefox. I suggest to increase this limit to 3840 and would like to hear your thoughts.
Or is this something I need to create a bug on bugzilla and discuss it there?
I suppose this is related to this issue that was reported recently. Like I responded there, we’re investing in a new theme API that should give theme designers more features and flexibility, and we don’t plan to make changes to lightweight themes in the future.