How can I disable 'backspace' key from navigating back a page?

Several times over the last couple weeks, I type up a very well thought out response on Facebook in political conversations with friends. An hour or two into my work, I hit backspace with the intent of editing what I wrote (maybe after I scrolled or something, so maybe I unintentionally took the edit window out of focus). The navigator takes me back a page and I lose my two hours of work. Infuriating! Shortcuts with the ability to wipe out two hours of works should be disable-able. Not only that, I feel that is an unsafe shortcut for this very reason, and would have added a SHIFT modifier key or something like that. I think I invented a cool word: disable-able.

You can set the Integer pref browser.backspace_action to 2 on the about:config page to disable the backspace action. BTW Shift + Backspace does the reverse: going Forward if possible, so that is taken as well.
* http://kb.mozillazine.org/browser.backspace_action
*http://kb.mozillazine.org/about:config

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You can open the about:config page via the location/address bar.
You can accept the warning and click "I'll be careful" to continue.
*http://kb.mozillazine.org/about:config
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*FlashStopper: https://addons.mozilla.org/en-US/firefox/addon/flashstopper/

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How can I disable 'backspace' key from navigating back a page?

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