From the Bring-em-in-on-time dept.:
The new bookmark and history system originally scheduled for inclusion in Firefox 2 will be disabled in official builds. First seen by Firefox users in the Bon Echo alpha build last month, the new bookmark and history system would have been the single most significant change between Firefox 1.5 and Firefox 2.0.

In an announcement posted to the Mozilla development USENET group, developer Michael Schroepfer said that the feature can't be completed adequately within the the 2.0 timeframe, and that saving it for a future release will give the core development time more time to focus on ensuring that Firefox 2 is as polished as possible. Although the bookmark and history system will not be included in the next major update, the underlying SQLite-based MozStorage engine, which was built for the new bookmark and history system, will be included for use by plug-in developers. Developers beware: the API for the MozStorage system hasn't frozen yet, so plug-ins that take advantage of this new feature may have to undergo rewrites in the future.

arstechnica