User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 when developing an extension, overlaid elements inside of the appcontent vbox or main-window, such as a vbox or an html:iframe are transparent over other chrome components (say, the toolbars) but not the document content. Reproducible: Always Steps to Reproduce: loading the following overlay displays a transparent vbox with a border: <?xml version="1.0"?> <overlay id="testTransparentOverlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" xmlns:html="http://www.w3.org/1999/xhtml"> <vbox id="appcontent"> <vbox style="position:fixed; height: 100px; width: 100px; border: 1px dotted blue; top: 20px; right: 20px; background-color: transparent;" /> </vbox> </overlay> Actual Results: the portion of the vbox over the chrome is transparent, but the portion over the document content is gray and the content underneath doesn't show through.

Sounds like this would be fixed by bug 130078.

This should be fixed now in the latest nightly trunk build, please test?

Thanks for looking into this. The issue isn't really resolved. see the newly attached test xpi. It renders a basic vbox in bottom left corner, as well as adds a menu in the menu bar for more shapes. In FF1.5, you get a non-transparent "Hello?". In Deer Park 1.6.1, you get nothing at all. The other shapes of interest are "as Chrome Frame" and "as App-Content Frame": they both have the same behavior in FF1.5 as in Deer Park 1.6.1 and the frame rendering in the chrome still isn't transparent on the app content document.

Ok, well, then this could be fixed by bug 130078. Roc has a patch for that, currently.

This bug was reported on Firefox 2.x or older, which is no longer supported and will not be receiving any more updates. I strongly suggest that you update to Firefox 3.6.3 or later, update your plugins (flash, adobe, etc.), and retest in a new profile. If you still see the issue with the updated Firefox, please post here. Otherwise, please close as RESOLVED > WORKSFORME http://www.mozilla.com http://support.mozilla.com/kb/Managing+profiles http://support.mozilla.com/kb/Safe+mode

No reply, INCOMPLETE. Please retest with Firefox 3.6.x or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.