Seems good and helpful, and uses the regex-"dialect" i am familiar with. Though I don't know it's name. 5 stars.
What I would find extremely cool, was if the URL modification patterns could also be applied on my bookmarks, so I would kind of "clean" them. Especially remove "trash" parameters of UTM campains or other unneeded GET-parameters in Social-Media URLs which prevent me from recognizing whether or not I have this page already stored in my bookmarks.
But likely not so little additional work to integrate this both concerning logic and UI.
Anyhow: Good extension, good work. Thank you!