Firefox - Content unexpectedly selected when _accessibility is enabled

[swashbuck]

Subject of the issue

I'm experiencing an issue in Firefox for Mac. When accessibility is enabled, clicking around the page will occasionally highlight entire blocks of content as if it's been manually selected.

Your environment

• FW 5.55.2
• Firefox (Mac). Does not happen in Chrome.

Steps to reproduce

1. In course.json, set _accessibility._isEnabled to true
2. Randomly click around the course

Expected behaviour

Text / graphics are not selected

Actual behaviour

Text / graphics are selected up to the point where you clicked

Screen recording

mouse-clicks.mp4