Atlassian Tweaks: Userscripts and userstyles with quality of life improvements for Bitbucket, Confluence, and Jira.
Git: copy commit reference: Userscripts to add a "Copy commit reference" button to commit pages of Git hosting providers.
Tab icon replacers: Collection of users scripts for different websites, that replace tab icons (also known as "favicons"). Each script, if active on a particular page of a website, replaces the default icon with some icon from the particular page.