Jupjup Privacy Policy
Last updated October 22, 2026

Short version: Jupjup works on your computer. It has no accounts and never sends the pages you read or the words you learn anywhere. If you say yes, it sends a few anonymous daily numbers (like "12 words looked up") to help us improve it. That's it.

WHAT JUPJUP READS
To underline words and show subtitles, Jupjup reads the Korean text on pages you visit and the subtitles of videos you watch. This happens entirely inside Firefox: the Korean analyzer and dictionary are part of the add-on. Page text is never logged or sent anywhere. The only page text Jupjup keeps is described under "What Jupjup stores" below.

KOREAN IN IMAGES (OPTIONAL, OFF BY DEFAULT)
If you turn on "Read Korean in images" in Settings, Jupjup reads the visible part of images on the page you're looking at from a screenshot of that tab, entirely on your computer, with a recognition engine and Korean model that are part of the add-on. The screenshot is used once and thrown away; nothing about it is sent anywhere.

WHAT JUPJUP STORES
In Firefox's add-on storage, on your computer only:
- Words, grammar, and sentences you save, with your notes, the page address and video time they came from, and your review history (your flashcards)
- Words and grammar you've marked as known (to find sentences at your level)
- Daily totals: reviews, cards saved, words learned, and minutes spent reading or watching Korean (your progress charts)
- For words you don't know yet that keep showing up: how many times you've met them, the kinds of site, and the latest sentence they appeared in, up to 3,000 words (the "Words you keep running into" list)
- If you use "Read Korean in images": the Korean text found in images, by image address, up to 300 images (so an image you've already read appears instantly next time)
- Your settings
You can see, edit, export, or delete all of it from the add-on's Library, Words, and Settings pages. Removing the add-on deletes it.

ANONYMOUS COUNTS (ONLY IF YOU SAY YES)
Jupjup asks once whether you'd like to share anonymous counts. Nothing is sent until you say yes in Jupjup and Firefox's "technical and interaction data" consent is also on (Firefox asks when you say yes). You can turn it off anytime in Jupjup's Settings or in Firefox's add-on permissions. If on, it sends:
- Once a day: how many words you looked up, saved, and reviewed that day, and the week you installed Jupjup. Saves are also counted by kind of site from a fixed list (YouTube, Netflix, other streaming, webtoons, news, Naver/Daum/blogs, social media, wikis, or "other websites"), never the site itself. No ID is attached, so these reports can't be linked to each other or to you.
- For the community counter: how many words you learned and sentences you saved, with a random install ID that isn't linked to you.
It never sends which words, which sentences, which pages or videos, or anything that identifies you. These counts are kept in a small database we run on Cloudflare (api.getjupjup.com). It doesn't store IP addresses.

REPORTING A MISTAKE
If you use "Something wrong?" on a word and press Send, Jupjup sends that word, its dictionary form, the sentence it appeared in, what you said was wrong, and your suggestion, so the dictionary can be fixed for everyone. Nothing is sent unless you press Send.

ANKI
If you use "Send cards to Anki", Jupjup sends your saved cards to the Anki app on your own computer through the AnkiConnect add-on (address 127.0.0.1). This never leaves your computer.

UNINSTALL SURVEY
If you remove Jupjup, Firefox opens a short optional survey on getjupjup.com asking why. Answers are anonymous.

PERMISSIONS
- Access your data for all websites: to find Korean text and subtitles on the pages you read, and (only if you turn it on) to read Korean in images. Processed locally, never sent.
- Storage: to keep your cards, known words, and settings on your computer.
- Context menus, active tab, scripting: for the right-click "Break down Korean" menu and keyboard shortcuts.
- Alarms: to send the optional anonymous counts and the optional Anki auto-send in the background.
- Optional access to 127.0.0.1:8765: only requested if you use "Send cards to Anki".

NO SELLING, NO ADS, NO ANALYTICS
Jupjup has no advertising, no analytics, and no third-party trackers. It never sells or shares data.

CONTACT
hello@getjupjup.com