Comment 3 for bug 629368

I made some tests, and it seems that it is due to a plugin of webkit (I didn't found which one).

However, as the webpage is only used to fill a form and get a token, we don't need to load plugins with webkit.
I made a branch with the line that disable use of plugins in the webkit instance used on twitter account registration in gwibber.
You should see it in "Related branches".