1. Visit https://github.com/fregante/refined-github/blob/incremental-tag-changelog-link/source/background.ts
2. There should be a << link to https://github.com/sindresorhus/refined-github/blob/master/source/background.ts

Example: (ignore the arrow)

How:

1. Edit the get-default-branch function to accept a user/repo string (and it should only use parseBranchFromDom if the string matches the current page)
2. Add the button on forks using the CSS code here: Default branch link: add support for forked repos #1132

More issues semi-related to this one: #1115 #1168 #1557