iOS is not supported by Firefox so I'm assuming this is either on Desktop or Mobile.

What platform are you having a problem on this with? Windows, Mac, Linux, or Android?

There's also been a number of bugs filed for the crash signature: gfxContext::PushClipsToDT(mozilla::gfx::DrawTarget

The latest is bug 974656.

P.S. The bug report is used for information only. Please do not comment on bug reports unless you have constructive information to add that will help.

The crash report shows that you run out of memory: System Memory Use Percentage: 95
So some process (Firefox extension) is using up all available memory causing Firefox to crash.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

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

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox