Firefox has a great extension called NoScript. Unfortunately, it’s not available for Chrome or Chromium.
I’d run into a problem, though–uMatrix was blocking my attempts to use some bookmarklets, notably the Instapaper save bookmarklets.
A little research showed that while bug reports had been filed, they’ve long since been closed. Reason given: It’s a browser problem, not something uMatrix is thwarting.
(To be clear: This is not at all uMatrix’s fault. It was my fault because I didn’t fully understand how the uMatrix rules work.)
To fix this problem, I manually whitelisted the instapaper domains in the rules listing.
To get there, you’re going to want to choose “Options” from the uMatrix menu. After doing so, click the “My Rules” tab.
These are the rules I added:
* instapaper.com * allow
* www.instapaper.com * allow
After saving my changes, the bookmarklet began working normally on all pages.
If you’re running into trouble with a bookmarklet, have look at the code & see which domains it’s referencing. Add rules similar to the ones I’ve listed for each, and you should be set.