Update README with Firefox addon link

[yamadashy]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @yamadashy, 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 enhances the project's documentation by adding crucial installation information for Firefox users. By including a direct link to the Firefox Add-ons page in the README.md, it streamlines the process for a broader audience to discover and install the addon, ensuring the documentation is comprehensive and user-friendly.

Highlights

• README Update: The README.md file has been updated to include a direct link for installing the Firefox addon version of the tool.
• Installation Clarity: The installation section in the README.md now explicitly labels the Chrome Web Store link as 'Chrome' and introduces a new 'Firefox' label for its respective addon link, improving clarity for users.

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[gemini-code-assist]

Code Review

This pull request updates the README file to include a link for the Firefox add-on. My review includes one suggestion to make the link to the Firefox Add-ons store language-neutral, which will improve the experience for international users by directing them to a page in their preferred language.

[gemini-code-assist]

The link to the Firefox Add-ons page includes a language code (/ja/) for Japanese. It's generally better to use a language-neutral URL to ensure users are directed to a page in their own language based on their browser settings. Please consider removing the language code from the URL for a better international user experience.

Suggested change

	- Firefox: [Firefox Add-ons](https://addons.mozilla.org/ja/firefox/addon/github-code-wiki-unofficial/)
	- Firefox: [Firefox Add-ons](https://addons.mozilla.org/firefox/addon/github-code-wiki-unofficial/)