I feel like I should apologize for this but I'm seeing a pdf.js issue that manifests itself the same way as the last one. I'm not resurrecting the last bug because that already has a legitimate fix but it looks like there might be more to do.

I'm running the 11-26 nightly build. I've still got gfx.canvas.remote manually set to true. I ran into this after many, many hours of reading pdfs. It, again, was during some scrolling.

Attaching a screen shot.

You definitely shouldn't apologise, all bugs gratefully received.

Do you see anything in the Failure Log part of the Graphics section on about:support? (assuming you can reproduce)

Didn't think to check. I'll post it if it happens again.

Hi David ... have you seen this recently with remote canvas enabled?

No. I have seen the strange symbols return a few times (not nearly as much as before) but bug 1607630 hadn't landed so I'll note something there if I see it again. That's the only issue I've run into recently -- this bug I haven't seen in months.

Thanks, I'm going to assume this has been fixed by other patches then.