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.
Opaite Mbohovái (2)
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?