DELETE
FROM
    moz_formhistory
WHERE
    timesUsed = 1

After examining the situation a bit, it seems that the cause of my severe firefox lag, is the form history sql database has over 8000 entries in it and every single character I type into the form I'm using, causes intense freezes while it scans this database. I've temporarily fixed this problem by opening the database "%\AppData\%\Mozilla\Firefox\Profiles\########.default\formhistory.sqlite" and executing this command; <pre><nowiki>DELETE FROM moz_formhistory WHERE timesUsed = 1</nowiki></pre> However, this shouldn't be needed. I am in an i7 running at 3.5GHz, and an SSD, with 32GB of RAM. I can't see why 8000 lines would be so hard for firefox to scan through with so much power available. Before I ran the command, I was being lagged so badly by typing even a single character into an input box, such as the title to this support post "form history". Simply typing F caused Firefox to freeze for 60 seconds. Please find a way to optimize firefox to be able to keep history without freaking out from large amounts of history. I dislike the newest firefox updates, now I have like 6+ firefox.exe running constantly in task manager instead of one and it didn't even slightly improve stability. :/ All it did was delete all the best old addons. I'd have done formatting in this post but I have no idea what these posts use for formatting such as code blocks and whatnot.