Due to technical reasons, the check frequency has been temporarily-ish decreased to 1 check per second.
Raising that number back to 30 will make sure the extension corrects aspect ratio as soon as change is detected. Doing so will also raise RAM usage to 30-500 MB if you opened your browser 5 seconds ago, north of 1 GB (way north) if your browser has been opened for a while.
Keeping check frequency low will make the problem go away (mostly), but aspect ratio corrections will be delayed a bit.