Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac Options) key, and then starting Firefox. 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 and select Submit.

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.

bp-d64e0205-01fe-44f8-b341-f6a6f2150706 7/6/2015 5:58 PM bp-27c386c2-ae09-4a48-8be3-59c362150706 7/6/2015 5:48 PM bp-5349325c-dd35-493d-b00d-96a172150706 7/6/2015 5:45 PM bp-191857fc-32fc-4bab-b049-00f772150706 7/6/2015 5:41 PM bp-907fe9dd-eefa-4350-954f-9280c2150706 7/6/2015 5:41 PM bp-b9aef35a-95c7-44b9-9c0a-5be1b2150706 7/6/2015 5:15 PM bp-8827fee2-b120-4d3b-81e7-885fa2150706 7/6/2015 5:15 PM bp-34d4409b-2fd7-4407-ba70-db8202150706 7/6/2015 5:14 PM bp-37ecbb14-8453-48e8-8364-2218b2150706 7/6/2015 5:14 PM bp-23538dea-54d2-4b8d-af11-3eea72150706 7/6/2015 5:11 PM bp-e256a657-7dc4-4c63-9297-a9ac62150706 7/6/2015 5:09 PM bp-22ff28b2-fdc4-49f7-ac45-eef262150706 7/6/2015 5:09 PM bp-eb36cffe-2d3c-4059-a12d-91fdf2150706 7/6/2015 5:04 PM

Let's see. The crash reports flagged;

msmpeg2vdec.dll = Microsoft DTV-DVD Video Decoder

Perform a System File Check to fix corrupted system files http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Run the Windows Update Program.