How do I erase all the thumbnails in new tab?

I didn't check the thumbanils in new tab for a long time, and now there a lot of these from my history, my question is how do I erase them without clicking the X mark again an again on every one?

If you click the X then you place those items in the blocked list.
That is the browser.newtabpage.blocked pref that you can inspect on the <b>about:config</b> page.
*http://kb.mozillazine.org/about:config
Note that Firefox still creates thumbnails of visited pages in the thumbnails folder when you disable the about:newtab page or aren't using it.
You can create this Boolean pref on the about:config page to prevent Firefox from generating thumbnails for the about:newtab page.
*name: browser.pagethumbnails.capturing_disabled with value: true
You can delete the thumbnails folder in the Firefox profile folder to remove already stored web page thumbnails.
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*https://developer.mozilla.org/Mozilla/Preferences/Preference_reference/browser.pagethumbnails.capturing_disabled
*http://mxr.mozilla.org/mozilla-release/source/browser/base/content/browser-thumbnails.js

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How do I erase all the thumbnails in new tab?

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