What exactly is in cookies.sqlite-wal?

My pc just crashed because of an issue with the ac adapter, and I can't exactly remember if firefox was closed or not. It wouldn't respond after opening it and didn't respond when opened in safe mode. I looked in the default profile folder and start to back everything up and noticed the cookies.sqlite-wal file was 16gb. I just moved it out of the folder and everything worked fine. Just thought it was odd.

Here's my understanding/guess: Firefox includes a SQLite database component that interfaces with the cookies.sqlite database. The SQLite component creates WAL files during regular operation to optimize performance and then reconciles the WAL file with the actual database at idle times or at shutdown. If the WAL file became corrupted, perhaps that caused Firefox not to be able to access cookies??
http://www.sqlite.org/wal.html

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    Hi, this is a bit complicated so please bear with me. Thank you.
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    Cookies
    cookies.sqlite
    [https://support.mozilla.org/en-US/kb/cookies-information-websites-store-on-your-computer Cookies] are used by websites for a variety of reasons, some of which include keeping you logged in to a website you have previously logged in to, remembering any preferences a website has allowed you to set, authenticating you as a person who has visited a specific website before, etc..
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    =======
    See the solution at the end of this post
    =======
    Not sure now what I tried to accomplish with this move, in Ubuntu 12.04 and Firefox 23 as my current browser version. Whatever, it did not have desired effect, Firefox will not save any cookies past the session anymore.
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    ==========
    Solution
    ==========
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    Firefox is set to use custom settings for history, and I accept all cookies, including third-party, and keep them until I close Firefox.
    I use the CookieMonster add-on to override this default setting on selected sites, so I can keep their cookies from one session to the next, which saves some site preferences, and keeps me signed in to my web site.
    Back on the Privacy tab, I clear history when Firefox closes, but in Settings, I do not include cookies. (I include cache and offline website data.)
    To include cookies here would cause Firefox to dump ALL cookies at the end of the session including those which save my site preferences and keep me logged in via settings in CookieMonster.

    Indeed the cookies.sqlite is the only file remaining of the cookies family of files when I close Firefox.
    Thank you for your assistance Cor-el!

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