Initially attempted in https://github.com/sindresorhus/refined-github/pull/455 <img width="790" alt="base branch highlight" src="https://cloud.githubusercontent.com/assets/1402241/26586700/9743deae-4582-11e7-9fcc-1609ad3d6f22.png"> I think this could be an easy addition to https://github.com/sindresorhus/refined-github/pull/3408 since it has the logic already and only needs ```diff if base === default branch hide base + else + highlight base ``` cc @kidonng
