Investigate compatibility with Just Read extension

A user reported in the Chrome web store that our extension seems to be incompatible with another one they use, called Just Read:

I'm not familiar with this extension or how it works, so creating this issue for future investigation.

Start by reviewing the Chrome Web Store report and the attached screenshot, then reproduce the reported incompatibility with the Just Read extension. Compare behavior with Just Read enabled and disabled; done means identifying the incompatibility and documenting a concrete next step.

Written by the indexing model from the issue text.