Frequently asked questions
Is Definer free?
You can use Definer's core lookup features for free. Some cloud features, hosted AI features, and higher customization limits require a membership.
How does Definer support its development?
Paid memberships help fund Definer's development and services. The extension does not show ads.
How can I support Definer?
Join the Definer subreddit to share feedback, report bugs, and suggest new features.
You can also help by spreading the word about Definer to friends, family, and language learners in your community.
What should I try when Definer does not work?
If Definer isn't working properly, try these steps:
- Try reopening your tabs or restarting the browser. Bubble won't work in tabs that were open before you installed the extension.
- Try disabling other extensions temporarily. Sometimes, extensions can conflict with each other.
If nothing helps, let's troubleshoot together:
- Email: definer@lumetrium.com
- Reddit: Definer subreddit
Please mention which browser you're using when reporting an issue.
Can Definer work on mobile?
Yes, Definer works on Android. See this guide for details.
How can I use Definer on a PDF?
See the PDF Reader guide for the available methods.
How can I use Definer on EPUB?
Definer can handle .epub files when you use an online reader like TTSU Reader.
Does Definer work in Google Docs?
Definer cannot work in Google Docs.
This is a known limitation affecting many extensions because Google Docs renders its contents within a canvas element, which restricts extensions from accessing text directly.
Workaround
Download your document by going to "File" → "Download" → "PDF document". Then open the PDF with Definer's built-in PDF reader to use popup dictionary there.
Does Definer work in Google Sheets?
Definer works with Google Sheets, but you need to enable "Editable blocks" in trigger activation rules to be able to look up text in cells.
Does Definer work in private browsing?
Yes, after you allow Definer to run there. Open your browser's extension settings for Definer and enable access in Incognito or private windows.
Can Definer work offline?
Most built-in Sources need an internet connection, but Definer also has offline options:
- Import dictionaries into the Offline Dictionary Source.
- Use a Custom Source for content on your device or local network.
- Connect the AI Source to local models through Ollama or LM Studio.
Is Definer open source?
Definer is not open-source.
There are no immediate plans to make it open-source.
Why does Definer need permission to read and change website data?
Permission to access data on websites is a technical requirement for Definer to function. This permission is necessary when you select text on a page to show definitions or other information.
For more details about each permission and how they're used, please read Definer's Privacy Policy.
Is Definer safe?
Platforms like Chrome Web Store and Firefox Add-ons conduct regular reviews of listed extensions. Definer has been in the extension catalogs for years (since June 20th, 2021) and has earned a good reputation and can be trusted.
Mozilla also requires developers to submit source code for every update, and they have manually reviewed Definer's code.
If you're technically inclined, you can also inspect what an extension does yourself. Extensions' code is not compiled into an unreadable format, as both Chrome and Firefox policies prohibit that.
This means anyone with some technical knowledge can examine it and spot anything suspicious.
Is there a Safari version?
Safari is not supported, and there are no plans to develop a Safari version.
Does Definer work on Kindle?
Definer is not compatible with Amazon Kindle, and there are no plans for Kindle support at this time.
Does Definer have History and Anki export?
Yes. History keeps your lookups, and Export can send saved Collection items to Anki.