Longshot is a Firefox screenshot extension I wrote to replace FireShot: full page, visible area, drag region and element capture, an editor with eleven annotation tools, export to PNG, JPEG, WebP and PDF, and local OCR that produces a searchable text layer. It has no runtime dependencies. The code is not public, so this is a description rather than an invitation to read it. At one point it had 130 passing Node assertions across six suites, zero failing. Printing could not open a dialog at all...