Pull request changed files page doesn't display diff files on firefox

[lunny]

pull request changed files page doesn't display diff files on firefox. It works on Chrome, OS is macOS.

https://gitea.com/gitea/docs/pulls/129/files

[silverwind]

You have set to hide whitespace-only changes and all changes are whitespace-only. Arguably, we could improve the display to show the reason why no changes are displayed.