Sheets Range to Image (Firefox extension)

Export a selected range of cells in Google Sheets as a high‑quality PNG — with full emoji support. The image is shown in an in‑page dialog where you can download it or copy it to the clipboard. Nothing is downloaded automatically.

How it works

1. Adds Sheets Range to Image to the native Google Sheets Extensions menu. Hovering it reveals Convert Selected Range to Image.
2. On click, a Converting Range to Image… pill appears at the bottom‑right of the page (in‑page only — not a Windows notification).
3. The extension reconstructs the image from the cell data. Google Sheets' copy data is a fully‑styled HTML table (fonts, colors, backgrounds, borders, alignment, merged cells and the real text incl. emoji) covering the whole selection — even rows/columns scrolled off screen. The extension renders that table to a high‑resolution canvas (3× supersampled), so the output is crisp and bounded exactly to the selected cells.
4. The PNG opens in an in‑Sheets dialog with Download PNG and Copy to Clipboard buttons.

Note: generating the image briefly uses the clipboard to obtain the selection data, so your clipboard will contain the copied cells afterwards.

Install (temporary, for development/testing)

1. Open Firefox and go to about:debugging#/runtime/this-firefox.
2. Click Load Temporary Add‑on….
3. Select the manifest.json file in this folder.
4. Open any Google Sheet and use Extensions → Sheets Range to Image → Convert Selected Range to Image.

Temporary add‑ons are removed when Firefox restarts. To install permanently, publish to AMO — see PUBLISHING.md.

Permissions

Permission	Why
clipboardRead	Read the selection's styled‑HTML (the copied cell data) to reconstruct the image.
clipboardWrite	Trigger the copy of the selection, and write the result on Copy to Clipboard.
Host access to docs.google.com/spreadsheets/*	The content script runs only on Google Sheets.

The extension is only ever active on https://docs.google.com/spreadsheets/*, requests no broad host permissions, and never sends data anywhere — all processing happens locally in your browser.

Notes & limitations

• The image is rebuilt from the copied cell data, so it is not limited to the visible viewport — the entire selection is rendered, at any size.
• Rendering uses the browser's own fonts. Standard Sheets fonts (Arial, etc.) match exactly; an unusual custom font not installed locally would fall back to a similar system font.
• Images/charts placed over cells aren't part of the copied cell data and are omitted (they would also taint the canvas and block export).

Files

• manifest.json — Firefox MV2 manifest.
• content.js — menu injection, clipboard reconstruction, toast, and modal.
• content.css — styling for the menu item, toast, and dialog.
• icons/icon.svg — extension icon.
• LICENSE — MIT license.
• PUBLISHING.md — how to package and publish to addons.mozilla.org.
• PRIVACY.md — privacy policy (no data collected).