Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8) Gecko/20051211 Firefox/1.5 Plus same date's trunk build. When the XUL cache is enabled, accessing document.styleSheets[].title from within a XUL overlay returns the correct stylesheet title the first time and is empty every time after. When the XUL cache is disabled, document.styleSheets[].title returns the correct title every time. I'm not sure if this is by design but I'm assuming the XUL cache is supposed to be invisible.

Comment on attachment 205613 [details] Testcase (apply as an overlay to demonstrate bug) When the XUL cache is disabled the "testcase" returns the following every time: Global 1 Global 2 Global 3 When the XUL cache is enabled it returns the previous message the first time and is blank on all successive loads.

I can confirm this with TB 1.5 release on Win2k: my addon's stylesheet got loaded fine, but its title was missing arbitrarily once in while. (I manipulate styles by script and grab the stylesheet by title - which didn't work, obviously. :( )

Fixed in bug 319654.