TypeError: elem.hasAttribute is not a function
everytime I open up a site this error message appears; it's closed and reappears with an option to not have it appear again which is checked and the message closed. It then does not appear again until I go to another site when the same thing happens.
I've used Firefox for years w/o any problem up to now.
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If you get this on multiple sites that are not all part of the same network, it could indicate that one of your add-ons is not fully compatible with Firefox 19. Could you check for updates here:
orange Firefox button (or Tools menu) > Add-ons > "gear icon" > Check for Updates
If no updates are found, or the problem continues, try disabling all nonessential and unrecognized add-ons on these tabs:
orange Firefox button (or Tools menu) > Add-ons > Plugins category
orange Firefox button (or Tools menu) > Add-ons > Appearance category
orange Firefox button (or Tools menu) > Add-ons > Extensions category
You can save the step of restarting Firefox until you've worked your way through all 3 lists.
Any change?