Could you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Try to use JPG or PNG image file format and make it public view.

Here ya go.

hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon or hardware acceleration is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

It's Ghostery. I disabled the add-ons 1 at a time and restarted the browser each time. I was able to repeat the issue multiple times with Ghostery.

Even Aurora is broken.