On July 11, 2016 GitHub changed their font ordering to prefer Segoe UI on Windows. I think the old ordering which preferred Arial over Segoe was better. I wrote this CSS for Stylish to revert some of the most prominent changes.
In FF install by Stylish > Manage Styles > User Styles > Install from URLs...
https://rawgit.com/jay/e99fe4fe7e7bd4feaf5f237e15717133/raw/GitHub-Ignore-Segoe-UI.css
| @-moz-document domain("github.com") { | |
| @font-face { | |
| font-family: "Segoe UI"; | |
| font-weight: normal; | |
| font-style: normal; | |
| src: local("Arial"); | |
| } | |
| @font-face { | |
| font-family: "Segoe UI"; | |
| font-weight: bold; | |
| font-style: normal; | |
| src: local("Arial Bold"); | |
| } | |
| @font-face { | |
| font-family: "Segoe UI"; | |
| font-weight: normal; | |
| font-style: italic; | |
| src: local("Arial Italic"); | |
| } | |
| body { | |
| font-size:13px; | |
| } | |
| .btn { | |
| font-size:13px; | |
| } | |
| h1,h2,h3,h4,h5,h6 { | |
| font-weight:bold; | |
| } | |
| h1 { font-size:30px; } | |
| h2 { font-size:21px; } | |
| h3 { font-size:16px; } | |
| h4 { font-size:14px; } | |
| h5 { font-size:12px; } | |
| h6 { font-size:11px; } | |
| .markdown-body h1 { font-size:2.25em; } | |
| .markdown-body h2 { font-size:1.75em; } | |
| .markdown-body h3 { font-size:1.5em; } | |
| .markdown-body h4 { font-size:1.25em; } | |
| .markdown-body h5 { font-size:1em; } | |
| .markdown-body h6 { | |
| font-size:1em; | |
| color:#777; | |
| } | |
| } |
