Smart popup assistant with translations, dictionary results, images, and AI insights powered by your preferred LLM provider and model.

Definer - Smart Popup Translator & Dictionary
Definer - Popup Translator, Dictionary, AI is a powerful Firefox add-on that provides instant translations, definitions, and AI insights through a pop-up bubble. By simply double-clicking a word or highlighting text, users can access multilingual results, images, and pronunciation audio from various sources, making it a versatile tool for language learning, research, and casual browsing. With extensive customization options and PDF support, Definer enhances readability and comprehension across web pages and documents.
Add-on stats
Manifest V3
Weekly download count: 140
Firefox on Android: No
Permissions:
- contextMenus
- storage
- unlimitedStorage
- tabs
- declarativeNetRequest
- identity
Host permissions:
- *://*/*
Size: 6.07M
Email: de*****@lumetrium.com
URLs: Website ,Privacy policy
Full description: See detailed description
Ranking
Other platforms
Not available on Android
Not available on Edge
User reviews
Pros
- Easy to use and customizable
- Works effectively across various websites
- Saves time with quick word lookups
- Combines multiple functionalities into one add-on
- Great user interface and detailed design
Cons
- Not open source and lacks Firefox team supervision
- Some functionality issues, such as the Google search feature not working
- Bubble doesn't disappear on certain websites without reloading
- Limited default source options and lack of multiple custom source support
Most mentioned
- Lack of supervision from the Firefox team and security concerns
- Desire for more customizable dictionary options
- Difficulty with functionality on some specific websites like Instagram
- Need for recommended badge in the Firefox Add-ons store
User reviews
by linshigong, 2025-02-25
Came here after dictionary everywhere or anywhere (whatever it was called) went down. Better if not perfect replacement.
by Firefox user 18846163, 2025-02-21
by underworld13, 2025-02-18
Add-on safety
Risk impact
Definer - Dictionary, Translator, AI Assistant requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood
We don't have sufficient data to confidently determine the risk likelihood of Definer - Dictionary, Translator, AI Assistant. Use it at your own risk.
Risk likelihood analysis details
- High This extension was recently updated in the past month. New updates may not be stable or safe.
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