Firefox Base64 Decode Selection

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A Firefox browser extension that allows you to easily decode selected Base64 encoded text using the context menu (right-click).

Key Features

• Context Menu Integration: Right-click on selected Base64 text to decode instantly.
• Smart Positioning: The decoded text overlay appears above or below your selection, automatically adjusted to stay within the viewport.
• UTF-8 Support: Properly decodes international characters including Korean, Japanese, Chinese, and emojis.
• One-Click Copy: Built-in copy button to copy decoded text directly to your clipboard.
• Visual Feedback: Toast notification appears when text is copied successfully.
• Auto Dark Mode: Automatically detects and matches your browser's dark/light theme.
• Keyboard Support: Press Escape key to close the overlay instantly.
• Click Outside to Close: Click anywhere outside the overlay to dismiss it.

Installation

You can install this extension in two ways:

1. From the Official Firefox Add-ons Store (Recommended)

• https://addons.mozilla.org/ko/firefox/addon/base64-decoder-on-selection/

2. Manual Installation (For Development & Testing)

This method is useful during development or for testing before the extension is listed on the store.

1. Download or Clone the Repository: Download or clone this Git repository to your local machine.

   git clone https://github.com/your-username/firefox-base64-decode-selection.git
   # Or download the ZIP file and extract it

2. Open Firefox: Launch the Firefox browser.
3. Navigate to Debugging Page: Enter about:debugging in the address bar and press Enter.
4. Select "This Firefox": Click on "This Firefox" in the left-hand menu.
5. Load Temporary Add-on: Click the "Load Temporary Add-on..." button.
6. Select manifest.json: In the file browser that opens, navigate to the folder where you downloaded or cloned the extension (from step 1), select the manifest.json file, and click "Open".
7. The extension will be loaded and appear in the list.

• Note: Temporary add-ons are removed when you close Firefox. You will need to repeat this process each time you restart the browser if you want to continue using it this way.

How to Use

1. Select the Base64 encoded text on any web page by dragging your mouse over it.
2. Right-click on the selected text to open the context menu.
3. Click on "Base64 Decode" in the menu.
4. A small overlay window containing the decoded text will appear near your selection.
5. Click anywhere else on the page to close the overlay window.