Nothing fancy, or special, but I use them so that I don’t have go to a site first and then search.
Over the years I’ve built one up that recognizes various record ID formats or other record numbers and automatically takes you to that record or forwards you to the site if you paste the entire url.
It has a few other keyword shortcuts to save on monotonous clicks.
Nowadays with slack and people being a bit web savvier in general it’s not as useful as it once was, but you’d be surprised how annoying it is to enter jira ticket ids over and over.
ah, kathack is amazing but doesn't work on https sites since it loads a script from an http server. and is broken by CSP too... a real shame. it's really beautiful!
The website Babylist (a baby registry site) uses a bookmarklet for adding things to your registry that they don't sell themselves. It was the first real world use of a bookmarklet I had seen in a loooong time.