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Actually the "vote" link should be used for endorsement.

Done, thanks for the tip. I wasn't sure the best way to show that I agree with the bug. I also voted for the bug.

When you add yourself to a bug's CC list, every other person CC'd on the bug is sent a "bugmail" notification that you are now CC'd. If you just vote for the bug, you can receive bugmail notification without spamming all the other CCs. That's what I do. :)

Too bad I'm reading this after commenting.

I saw the CC list, but I assumed this would subscribe me to email notifications about this bug, which I don't want to receive.

I'd like to fix this, but it seems like cutting-edge bugzilla doesn't have a "delete comment" feature...

Yes, the CC list will subscribe you to email notifications about the bug, and does not really indicate support, only interest in receiving email notifications about the bug.