Who uses Greasemonkey for either Firefox or Chrome? I just discovered the advantages of it and love it. I don't expect this to get pinned, but I wanted users to share what scripts they found useful and if they could post a link to them. What's nice about Chrome is that they just install without a separate add-on - they're totally integrated.
I didn't get on with Stylish, can't remember why, but been using Greasemonkey for a few months now. These are the scripts I'm currently using (all linked ):
Download Youtube Videos: Downloads Youtube videos in a variety of formats straight from youtube's servers. Formats are: FLV, MP4, and 3GP in low and high quality for FLV and 3GP, also now 720p for videos that support it.
Google Images direct links: Makes images link directly to the original in Google Images search. The source website link is moved to the green URL below the image.
Google Un-safe Search: Turn safe search off permanently without being logged into Google
livejasmin blocker: Block livejasmin.com pop-under (which is extremely difficult to block by normal methods)
Result Numbers: Adds a number in turn to web search results of Google.
Userscripts Updater: Easy way to check for scripts updates. Automatic checking.