Changes

We could add a new redirect function to the existing nsIGlobalHistory2 or add it in a new interface nsIGlobalhistory3. Adding to the existing interface is cleaner, but would force embedders to update their history code. A new interface could be optional (docshell would fall back on AddURI if history didn't QI to nsIGlobalHistory3) so embedders would not have to change, but it would make history more difficult to understand. Probably adding an additional method is preferrable; the GeckoFlags function was successfully added without too much pain to GlobalHistory2 in Firefox 1.5.

Global history would maintain queues of URLs for typed and bookmarked flags. When new URLs come through that have no referrer, it would check these queues to see if the URL had either of these flags set. This requires no changes to non-history system code, but it could be confused in some unusual cases (for example, if the user types and and follows a bookmark in quick succession for the same URL). The side effect of getting it wrong is very minor.

* New virtual function OnRedirectStateChange in docloader.