I have iMac running os x yosemite and my firefox is not working.
The menu bar looks fine, but the actual window/tab is blank (see image).
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You can try start Firefox in Safe Mode by holding down the Shift/Options key.
You can try to disable hardware acceleration in Firefox.
- Firefox > Preferences > Advanced > General > Browsing: "Use hardware acceleration when available"
You need to close and restart Firefox after toggling this setting.