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Language Lens

Transform your daily browsing into a language learning experience! Language Lens replaces words on webpages with their foreign equivalents, helping you learn naturally as you read.

How It Works

1. **Setup an AI Language Model** - Choose your language model and API key - this is needed to translate sentences properly
2. **Choose Your Language** - Select which language you want to learn
3. **Browse Normally** - Visit any website you usually read
4. **Learn Naturally** - Some words will be replaced with their foreign equivalents
5. **Hover to Learn** - Mouse over any translated word to see its meaning
6. **Automatic new words addition** - New words are added to your vocabulary based on your knowledge

Features

• **Smart Word Selection** - Gradually introduces new words based on your knowledge
• **Instant Translations** - Hover over any translated text to see its original meaning
• **Progress Tracking** - Automatically tracks which words you know well
• **Fast & Light** - Minimal impact on your browsing experience

Setup Instructions

1. **Install the Extension**
- Click "Add to Firefox" and grant the necessary permissions
- The Language Lens icon will appear in your browser toolbar

2. **Configure Language Model**
- Click the Language Lens icon to open settings
- Under "LLM Settings", choose your preferred provider:
- OpenAI (GPT models)
- Anthropic (Claude)
- Google (Gemini)
- OpenWebUI (for local models)
- Enter your API key for the chosen provider
- Select your preferred model

3. **Choose Learning Language**
- Select your target language from the dropdown
- Available languages include Japanese, Chinese, Korean, Spanish, French, German, Polish, Welsh, and Latin

4. **Optional: Configure Domain Filtering**
- Use "Domain Filtering" to control where the extension works
- Choose between blacklist (block specific sites) or whitelist (only work on specific sites)
- Add domain patterns like "example.com" or "*.example.org"

Using the Extension

1. **Managing Your Vocabulary**
- Add new words manually using the "Add New Word" form
- Use "Suggest Related Words" to get AI-powered word suggestions
- Search your vocabulary using the search bar
- Remove words by clicking the × button
- For Japanese: toggle kanji display for individual words

2. **Reading Webpages**
- Browse websites normally
- Some English words will be replaced with their foreign equivalents
- Hover over translated words to see:
- Original sentence
- A list of translated words
- Click the 🔊 icon to hear the pronunciation

3. **Track Your Usage**
- View token usage under "Token Usage"
- Set daily and monthly token limits

Privacy & Data Usage

• Your API key is stored locally and used only for translations
• Word lists and settings are stored in your browser
• No personal data is collected or shared
• Token usage is tracked locally for your reference
• Sentences to be translated are sent to your selected AI provider - this is the only data that leaves your browser