Hi, since it's OK in Safe Mode, this article should help you find the cause - Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

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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-07d8e611-ab44-4e34-8c09-e2a012150821 21/08/2015 20:44 bp-4886ac77-0505-4d8d-91b3-79a082150821 21/08/2015 17:05 bp-ae520b7c-98ae-4b8b-b49e-ead402150821 21/08/2015 15:04 bp-4ae576bb-1e22-494e-bcbd-196f32150821 21/08/2015 15:04 bp-8ebdf429-f19c-4098-b6b6-e130e2150821 21/08/2015 15:03 bp-105a1298-80ff-4aeb-a44b-031d52150821 21/08/2015 15:03 bp-f7690559-d991-45f5-ab3a-0cdc42150821 21/08/2015 15:03 bp-2bf14a2d-9dfe-436f-97d6-1cb2e2150821 21/08/2015 15:02 bp-fbdce3e2-064b-43bf-af19-70be12150821 21/08/2015 15:02 bp-099e5106-e738-4007-8319-edc1b2150821

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

You can try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes