Currently, we can get to the InstallTrigger instantiation via a DOM window. But, when XPInstall is disabled the InstallTrigger methods don't do any work (they look at the pinstall.enalbed pref and bail if it's false). The update notifications client of InstallTrigger is one case where we need InstallTrigger to be a component (that we can get directly) so that we don't get affected by whether XPInstall is disbaled or enabled (since update notifications can be enabled/disabled separately from XPInstall being enabled/disabled). This also entails moving the check for xpinstall.enabled out of the InstallTrigger code into the install trigger JS glue.

Or, I might add, create an additional pref on whether web content can use the InstallTrigger object to check versions. I can imagine scenarios where someone would want XPInstall itself on, but disable version sniffing. In any case privileged code should be able to bypass those checks.

nominating for nsbeta1. This blocks a top priority Mozilla1.0/MachV feature.

Adding dependency of update notifications on this work.

Dan, could you plus or minus this, and if plus, give it mozilla 0.9.9 or mozilla 1.0?

Not too hard: we're already a component, just not a scriptable one.

minusing per adt traige

We need this to break the only dependency of nsUpdateNotifier.js on the hidden DOM window. CC'ing danm so he can renominate for nsbeta1 if he feels strongly that Mach V shouldn't ship with this dependency.

You're not using the hidden window as a parent of some dialog window (right?). If I remember correctly, you're using its JS context in a component because you don't have a window to use. If that's correct, I agree with the nsbeta1-. The hidden window won't be removed any time soon. This is another case where there's no alternative I can think of.

Well, the alternative is to fix this bug. But sure, nsbeta1- sounds fine by me too.

In some cases, enterprise IT admin might want to disable xpinstall but keep update notification. -> custrtm+

The xpinstall script engine has been removed from the trunk, bugs in it are obsolete.