When i focus on navigation bar using "CTR + L" to search(i use duckduckgo as default on firefox) always the result has "canonical&ia=web" at the end of www direction: What does it mean?
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t=canonicalis a partner tag that allows Ubuntu to generate revenue from searches on DuckDuckGo that use Ubuntu (anonymously)
Source DuckDuckGo on Twitter
Through partnerships with developers and companies, DuckDuckGo has been integrated into many applications. In these partnerships, a portion of DuckDuckGo's advertising revenue is sometimes shared back. To assign advertising revenue and collect anonymous aggregate usage information, developers add a unique "&t=" parameter to searches made through their applications.
&ia=web - the
ia is short for "instant access" but I can't find a good web reference that describes this parameter.