Why Firefox keep crashing, plugin-container using lots of memory? Also, the browser page jump up and down when it crash?

Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac=Options)'' ''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Is the problem still there? While still in Safe Mode, In the address bar, type '''about:crashes'''<enter>.''' Note:''' If any reports do not have '''BP''' in front of the numbers/letters, click it to submit them. '''The crash report is several pages of data.''' '''We need the report numbers to see the whole report.''' Using your mouse, '''mark''' the most '''resent 7 - 10''' crash reports, and '''copy''' them. Now go to the reply box below and '''paste''' them in. (Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.) ;[[Image:aboutcrashesFx29|width=500]]