Farsight Security's GUI for making DNSDB queries, available for Mozilla's Browser
To use the DNSDB Scout Extension you must first have the Mozilla Firefox web browser installed on your system. DNSDB Scout should work on any operating system that can run an up-to-date version of Firefox with native extension support. Unfortunately, that means iOS isn't supported at this time.
You also need a valid DNSDB API key. DNSDB API keys are portable, so if you already have one, you are ready to go. You can also sign up for a 30-day free trial right form within DNSDB Scout, or by visiting https://www.fasightsecurity.com/trial-api/
The only substantial difference is the Firefox version allows for a maximum of 50,000 query results to be displayed at a time as opposed to 10,000 in the Chrome version.
As with all current Mozilla Firefox extensions, they must be obtained and installed via the official Mozilla Add-ons site.
You can search the site for 'DNSDB' or 'Farsight', or by visiting https://addons.mozilla.org/en-US/firefox/addon/farsight-dnsdb-scout/
Since a Mozilla Firefox extension runs inside your browser, it competes for system resources just like any other browser window or tab.
The maximum number of results a DNSDB API call can return is 1,000,000. In order to manage browser performance responsiveness, DNSDB Scout for Firefox has a maximum limit of 50,000 results.