Also adjusted mac siteicon-[secure]-bg.png to not have opaque pixels, which would cut content (e.g. Top progress bar).
Filled bar is now drawn independent of textRect.
- instead of injecting semi transparent block into page, we
just set background of the whole widget frame to semi
transparent image
- fixes issue, when sometimes background filled only half
of the page
this issue occurs sometimes when more than one frames
were in page
