When the option "color accessibility" is turned on it can be hard to see the text that I've selected.

If the text selection for a given browser / OS combination is close to the background colors used to highlight lines then it can be hard to distinguish the selection in the foreground to the background color.

When color accessibility is turned on, the text selection color should be controlled by Bitbucket so that it remains suitably visible with enough contrast between the fore- and background highlight colors.