Search Results Sort By Date Not Relevance
Search Results Sort By Date Not Relevance is a Thunderbird extension that changes the default order of search results to "Date" instead of "Relevance".
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Background Tabs
UPDATE: Background Tabs is no longer developed -- as of Firefox version 64, you can set the about:config preference browser.urlbar.ctrlCanonizesURLs to false and use ctrl-shift-enter to open tabs in the background. This won't work for the search bar. A feature request for that is here. Unfortunately, there is no longer a way (that I'm aware of) to implement background tabbing in recent versions of Firefox via an extension.
Background Tabs is a Firefox extension that enables searches from the search bar or entries to the URL bar to open in background tabs by using the [CTRL] key when hitting [ENTER]. (Current versions aren't working from the search bar, though -- might be a Firefox bug...)
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