This provides thumbnail for tooltips on "Back" and "Forward" buttons. You can understand which page is loaded after clicking the "Back" (or "Forward") button, so you'll decide easily about clicking buttons, to do or don't.
* If you install Rewind/Fastforward Buttons ( https://addons.mozilla.org/firefox/addon/1934 ), this works together.
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then please write an e-mail to legacy [at] collector dot org.