Out of nowhere, my cursor speed in Firefox has slowed to a truly unusable crawl. I refreshed a page and it was suddenly inching along at worse than a snail's pace. I'm using a USB trackball mouse. This is only affecting Firefox; no other applications have this issue. Using Windows 10. Here's what I've tried so far: * Restart Firefox * Started Firefox in Safe Mode * Restart computer * Create a new profile in Firefox * Check my mouse's firmware * Try a different mouse There was [https://support.mozilla.org/en-US/questions/1266980 another question] about this years ago, but the accepted answer about accidentally enabling a Windows accessibility feature doesn't say which feature it is or how to disable it (if that's indeed the case). The link also seems to redirect to a generic accessibility page.