While this is extremely useful and a huge time-saver when it comes to finding specific words on the current tab, FindBar Tweak for Firefox lets you go a step further. This add-on gives you the ability to search for text in all of your tabs, not just the current one.
To use it, install the add-on (no restart needed) and you should immediately see a “find in all tabs” option when you bring up the find bar. To search for text in all tabs, click on “Find in All Tabs” at the end of the bar to open a search results window. Enter the text that you’re looking for and you’ll see the results for all your open tabs.
If you have multiple windows open, FindBar Tweak will look through the tabs in those windows as well. Click on an item and you’ll immediately be taken to where it is on the page – even if it’s in another tab or window. If you keep a lot of tabs open at all times, this tool is sure to help boost your productivity. Image credit: Steampunk Victorian Search Document Icon