Brief Summary
Currently the text search is performed only on the active page/tab and not on all open pages/tabs.
Details:
An option (a check button for example) should offer the possibility of searching for a text or word on all the contents of the tabs opened in the active window and not only on the tab in the foreground.
This would be a very useful function in the context of information searches where one can, on a given subject, have opened multiple tabs and pages. This would avoid relaunching the search for each tab.
Image/Video: