Both FireShot and GoFullPage capture an entire web page, including content below the fold that a normal screenshot misses. The difference is what happens after the capture: one focuses on a fast, simple export, and the other adds an editor for marking up the image before you save it.
Full-page capture: how each one works
Both extensions scroll the page automatically and stitch the visible sections into one image, so you don't need to take several screenshots and merge them. GoFullPage runs the capture and offers PNG or PDF export immediately. FireShot captures the page and opens it in its own preview screen before you export or edit it.
Editing and annotation tools
FireShot includes basic editing: cropping, adding text, arrows and highlights directly on the captured image before you save it. GoFullPage keeps the flow simpler, with capture and export as the main steps and no built-in annotation tools, so you would edit the image in a separate app afterward.
Exporting and saving your screenshot
GoFullPage exports to PNG or PDF and can copy the image straight to your clipboard. FireShot supports saving as an image or PDF, printing the page, and in some versions uploading directly, giving you more output options once you've finished editing.