> No root cause analysis or anything deep.

Spending time to create a test case and sending it to the browser bug team gets the bug fixed? Riiiiiiiiight.

Actually I did that for a while and the Chromium team would occasionally fix some fairly subtle issues: assuming I could make a demo of the problem and took the time to write up a good bug report. Maybe they just liked me! The Chromium team also wrote fantastic public followup to bug reports (whether fixed or not).

Certainly I never had any luck getting even extremely serious browser bugs fixed by anyone else (Apple, Mozilla, Microsoft) regardless of how much time I wasted trying to give good informative bug reports. And you never found out anything further - talking to walls is more productive.

It feels good trying to help the world be a better place, but it wasn't worth it.

Don't waste your time fighting windmills. Find a workaround, document it with a comment, forget about it. Do something that makes your business successful instead.