Where Does Stylus Store Userstyles and Settings?
Stylus keeps installed userstyles and settings in per-profile browser extension storage, with JSON backup.
Last updated
Stylus stores userstyles in extension storage inside the active profile. Installed styles, custom CSS, and options share that space. There is no user-facing styles folder to copy.
Fresh profiles start empty, which bites people who themed dozens of sites. The JSON backup on the options page is the whole migration story. It works across Chromium and Firefox builds alike.
Where Stylus stores this, by platform
%LocalAppData%\Google\Chrome\User Data\Default\Extensions (per profile)
Userstyles per profile. JSON backup covers styles and settings together. Updates resume from style URLs after import, so the file is mainly a snapshot.
~/Library/Application Support/Google/Chrome/Default/Extensions (per profile)
Same model on Mac. Firefox keeps it under ~/Library/Application Support/Firefox/Profiles. Back up before browser resets, since those wipe extension data.
Frequently asked questions
How do I move Stylus userstyles to a new browser?
Open the options page and back up to JSON, then import on the new profile. Every userstyle plus settings travels in that file. Style updates re-fetch from their URLs afterward.
Does browser sync carry Stylus styles?
It covers basic settings when enabled, but the JSON backup is the complete path. Large style collections and custom CSS survive only through the file. Export before profile wipes regardless.
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