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Examples of sites with menus that don't work:
I get no error messages. I have started Firefox in safe mode, I have also reset Firefox.
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Just an update - I've upgraded to Firefox 25 and Windows 8.1 and the problem has not changed.
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.
cor-el, I tried what you suggested and a new profile does not change anything.
It's worth noting that the exact same problem exists in Chrome, but not Internet Explorer.
If a new profile didn't help and it also happens in Google Chrome then maybe your security software is causing this issue.
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.
cor-el, it does not work in safe mode or with my security software disabled.
I have found the root cause and it's not good news: It's the touchscreen.
This is Windows 8.1 on an HP all-in-one.
When I disable the "HID-compliant touch screen" in Device Manager, the problem instantly goes away. When I re-enable it, the problem comes back.
Hi fiveskin, I thought that the about:config changes you made before --
dom.w3c_touch_events.enabled = 0 dom.w3c_touch_events.expose = false
-- would prevent sites from detecting touch capability and cause them to serve mouseable pages. Perhaps there is another way that sites are learning about the touch capability. Flash or another plugin? Or maybe an old "Flash cookie"?