I asked a question that didn't receive enough attention, so I started a bounty. It remained unanswered for a week, and my bounty automatically closed, but I didn't get my points back. How is this helpful? I didn't any answers or even hints (I didn't even receive more attention), so my bounty was basically wasted. Now I want to start a new bounty with more points, but don't have enough. How is this an encouraging feature?
That's the risk you take with a bounty. Once the bounty is set you lose the points.
No one is under any obligation to answer your question and if no one knows the answer then they're not going to answer bounty or not.
I can only suggest that you add any extra information you've managed to find from your continued investigations - you are still actively looking for a solution aren't you?
Nice to see your question answered. I would say (in this particular case...):
Here is the Q&A : Google Calendar colorize weekends in Firefox