Here's a partial list:

  - Dark Night Mode

  - FireShot

  - Force Background Tab

  - Google Docs Offline

  - Google Mail Checker

  - Hacker News Enhancement Suite

  - Image Downloader

  - Instapaper

  - LastPass

  - Linkclump

  - Popout for Youtube

  - Privacy Badger

  - Read Aloud

  - Reader Mode

  - Reddit Check

  - Reddit Enhancement Suite

  - ReviewMeta

  - Send from Gmail

  - Tampermonkey

  - The Camelizer

  - uBlock Origin