The "ghost" caret also appears when I'm pressing left or right arrow keys to move the caret. It seems to be white, even when the real caret is black on white background. It is easily seen when a text field background is a dark color. It appears for about one frame, my screen refresh rate is 60Hz. It doesn't seem to be a "fake" caret or merely a graphical element. When I'm editing a field of text, eg. in Google Docs, I've occasionally started editing or selecting text one character to the right. Like as if in that split second I just happened to send the keystroke when the ghost caret appeared. But because it was so brief, it is near impossible to replicate. I've tried Firefox in safe-mode and there was no ghost caret. So I removed all add-ons/extensions, but the ghost caret still appears even if I have no extensions installed, which is why it's so baffling. I've refreshed and re-installed Firefox, both didn't work. This "ghosting" only happens in Firefox, not in IE nor Chrome. I used a screen capturing software and recorded this problem, then extracted a frame from the video to show the real caret and ghost caret side by side. Hope this better illustrates what I'm seeing. I have Dark Reader activated so the ghost caret can be easily seen. If Dark Reader isn't activated, it would be impossible to see due to the white background. I do most of my work on cloud based platforms so this ghosting is very annoying and distracting. Or worse, could it be a keylogger or malicious program causing this? Please help, Thank you!