Search across all open tabs in FireFox
The All Tabs Helper add-on for FireFox lets you search for strings across all open tabs in the web browser. After installing the add-on, click on the blue letter A icon in the tool bar at the top of the browser.
You’ll see you have the option to click on search on the right. If you enter a search term, the tabs on which the term appears will be listed below. Click on the name of any one tab to get a list of the search hits in context.