DevTools API - Firefox Developer Tools
method description new toolsidebar(xul:tabbox, toolpanel, uid, showtabstripe=true) toolsidebar constructor void addtab(tabid, url, selected=false) add a tab in the sidebar void select(tabid) select a tab void hide() hide the sidebar void show() show the sidebar void toggle() toggle the sidebar void getwindowfortab(tabid) get the iframe containing the tab content tabid getcurrenttabid() return the id of tabid of the current tab tabbox ge...
...ttab(tabid) return a tab given its id destroy() destroy the toolsidebar object events description new-tab-registered a new tab has been added {tabid}-ready tab is loaded and can be used {tabid}-selected tab has been selected and is visible {tabid}-unselected tab has been unselected and is not visible show the sidebar has been opened.

tabs/utils - Archive of obsolete content
returns browser : gettabid(tab) get the specified tab's id.

WebRequest.jsm
filtering by windowid and tabid is not supported.