Browsing Protection slows down Firefox after updating the browser to 56.0.2 version
I've been exeperiencing problems with Firefox when F-Secure Browsing protection is enabled after Firefox updated to the newest version (56.0.2). The browser opens slowly, frequently becomes unresponsive and eats up to 90% of memory (from the 8 GB RAM total). When I disable the F-Secure extension and launch the browser again, the browser behavior goes back to normal. I'm running Windows 8.1 64-bit, and relevant extra info related to the issue might be that I'm opening Firefox with quite large amount of tabs (appr. 250-300). I didn't experience the issue before the Firefox update.