OptionalactiveOptionalcontainerFirefox only.
0 = default (main) container1, 2, etc. = internal container indexOptionalinsertInsert the new tab next to the current tab and set its openerTab so when it's closed the original tab will be focused automatically. When false or not specified, the usual browser behavior is to open the tab at the end of the tab list. Default as true.
OptionalpinnedPin the tab (i.e. show without a title at the beginning of the tab list). Default as false.
Make the new tab active (i.e. open in foreground). Default as
true.