User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20100101 Firefox/17.0 Build ID: 20121130221520 Steps to reproduce: Middle click on text fields sometimes results in taking me to the URL I wanted to paste in the said field instead of actually pasting it. I'm losing the text field changes I made so far. For example working with jenkins CI web interface can cause that. IMHO this feature should never be enabled without user consent and it should be easier to find out how to disable. Using Firefox 17.0.1 from Fedora 18.
Basically bug 366945, except for the dataloss part.