go to "about:config" in the URL bar. in the filter box, type "editor.single" and change the pasting pref from 1 to 3. Now, when you have:
www.goo
gle.com
on the clipboard and paste into a single-line text box (like, say, the URL bar), it will strip the newline, and paste www.google.com
This is useful to me when an email app (or anything) breaks a link across multiple lines. (see bug 23485)
www.goo
gle.com
on the clipboard and paste into a single-line text box (like, say, the URL bar), it will strip the newline, and paste www.google.com
