User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36 Steps to reproduce: 51.0.1 (64-bit) MacOS I had lots (approx 8-10) of windows open. Each window had lots (5-15) of tabs open. Actual results: The computer starts to get hot (fan starts running), and then the selected viewable webpage begins to "twitch" vertically down then up, as if scrolling. I am able to select other tabs/windows, but I am not able to interact with any elements/scrollbars/fields etc. I need to Force Quit Firefox. I did choose to send the bug report that automatically came up after restart. It may be under the user firstname.lastname@example.org. This happened several times. I now run fewer windows/tabs with no problem. Expected results: Firefox continues to act normally, no matter how many windows and tabs are opened.
Provide me more information: Does the bugs is with firefox browser? Did you experience these issue in firefox beta? Does it happens in the latest version of firefox? Will you send a screenshot of it, which helps to solve your issue? It seems to be the issue of slow and laggy of bug id 1334367. Let me mrk it as duplicate of 1334367 till the user comments. [bugday-20170306]
Closing this issue due to lack of response from the reporter. Please reopen if this issue persists.