Thank you for your report. This addon has no effect on fullscreen vs. windowed, and it is also the first report of such an issue. It is possible you might have a conflict with another addon, or even a video driver problem. Does the issue persist with a clean install of the latest Firefox and/or disabling any other addons? After your report, I've tested this addon on both Windows and Linux and have no problems with fullscreen. If trying these steps resolves your issue, or further assistance is needed, please consider a follow-up and an update to your rating. It would be greatly appreciated.

Glad the addon has helped. Thank you for your review and rating, it is greatly appreciated!

Thank you for your review and rating, it is greatly appreciated!

Thank you kindly for your review and rating, it is greatly appreciated!

You're very welcome, and glad this addon is useful! Thank you for your review and rating, it is greatly appreciated!

Hello,

There is an updated version available which should address both of the issues you describe here. Please update via this page by clicking "Add To Firefox" button and allow any permissions. Alternatively, you should be able to update via the local about:addons page.

If the issue persists, please contact [email protected] for further troubleshooting. If the update solves the issue, kindly consider updating your rating.

Thank you for your review!