Gigablast Search (Unofficial)
What is Gigablast Search (Unofficial)?
Gigablast Search (Unofficial) is an open-source web extension for Firefox that allows users to conveniently add Gigablast.com as a search engine to their browser.
Please keep in mind that you don't need to install this extension to add the search engine to your list of available engines. You can add it via the search or address bar (https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox). This is just for convenience.
Gigablast Search (Unofficial) is relatively safe to use as it requires very minimum permissions.
Gigablast Search (Unofficial) has earned a fairly good reputation and likely can be trusted.