Firefox support

[jorgeasaurus]

Pull Request Summary

• Added a Firefox-specific build pipeline that swaps in MV2 assets after the webpack build completes, including the new scripts/build-firefox.js, public/manifest.firefox.json, and devtools bootstrap scripts.
• Introduced a cross-browser runtime wrapper (src/common/browserApi.js) and updated consumers (for example, src/common/client.js) so promise-based messaging and storage work in Firefox.
• Refreshed the DevTools command bar with custom SVG icons while extending docs to highlight Firefox availability and providing a dedicated setup guide (FIREFOX_README.md).

[gemini-code-assist]

Summary of Changes

Hello @jorgeasaurus, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the extension's reach by adding full support for the Firefox browser. It involves creating a specialized build process for Firefox, developing a robust cross-browser API compatibility layer to handle platform differences, and updating the user interface with custom icons. Additionally, comprehensive documentation has been added to guide users and developers through the Firefox-specific setup and usage.

Highlights

• Firefox Compatibility: Introduced comprehensive support for Firefox, enabling the extension to run on Mozilla's browser. This includes a dedicated build pipeline, a Firefox-specific manifest (MV2), and browser API compatibility layers.
• Cross-Browser API Wrapper: Implemented a new browserApi.js module that provides a unified, promise-based interface for browser APIs (like storage and messaging), abstracting away differences between Chrome/Edge and Firefox.
• Updated DevTools Command Bar: Refreshed the DevTools command bar with custom SVG icons for 'Save script' and 'Clear session' actions, improving visual consistency and user experience.
• Enhanced Documentation: Added a detailed FIREFOX_README.md guide for building, testing, and publishing the extension on Firefox, and updated the main README.md to reflect Firefox availability and installation instructions.

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[jorgeasaurus]

Addressing #2

[gemini-code-assist]

Code Review

This pull request introduces Firefox support, which is a great addition. The changes include a new build pipeline for Firefox, a compatibility layer for browser APIs, and updates to documentation.

My review has identified a critical architectural issue: there are four different and inconsistent strategies for handling cross-browser API compatibility. This will make the code difficult to maintain and debug. I strongly recommend standardizing on a single approach. The explicit wrapper module src/common/browserApi.js seems like the most robust and maintainable option.

Additionally, I've found a couple of unused files that appear to be remnants of alternative implementations. Removing this dead code will improve clarity. I've also suggested some refactoring to reduce code duplication and improve efficiency in the new helper modules. Finally, there are a few minor inconsistencies in the new FIREFOX_README.md that should be addressed.

Overall, the PR is in good shape, but addressing these architectural and maintainability points will significantly improve the quality of the codebase.

[jorgeasaurus]

Addressing Gemini Code Comments and reopening.

[wbaeck]

@merill

🎁 EMERGENCY MERGE: Santa needs this code! 🎅

Please, oh please! Grant this little PR its Christmas miracle! 🙏

Let's get this done before Santa makes his rounds! You're the best!