Firefox was creating memory-backed temporary tables and syncing them to disk; however, the process of regularly syncing to disk while using the browser caused i

Firefox was creating memory-backed temporary tables and syncing them to disk; however, the process of regularly syncing to disk while using the browser caused issues. It also added to start-up time requirements. For example, if you don't want to hold the entire history in memory but only the most recent changes, you have to create a view spanning the temporary table and the on-disk table to do history queries (so the Awesomebar returns results from pages you just visited, as well as ones already written to disk) and things get complicated.