Add a configurable userscript that fills login forms (i.e. the fiels
"Username" and "Password) of websites using a configurable backend where
the actual passwords are stored. The only backend yet is using the
password store "pass".
But only hide those tags that aren't children (or descendants) of other
tags that get replaced anyway. That is needed because sometimes, flash
videos are in <embed> tags, sometimgs in <object> tags and sometimes in
<embed> tags within <object> tags.
Furthermore enforce our "click here" link to have transparent background
(and in future: remove as many properties from website specific CSS
stylesheets).
This means: also replace <object> tags and put the replacement message
even higher in the z-order. (Latter had to be done to make it the
replacement visible on espn _dot_ com)
