Reddit User Vibe by Revadike

A browser extension for Chrome and Firefox that gives you an instant vibe of who's commenting. It displays coloured split-pill badges next to Reddit usernames showing their most active subreddits — visible at a glance without leaving the page.

Works on both www.reddit.com and old.reddit.com.

HOW IT WORKS
When an author link scrolls into view the extension queries the Arctic Shift API to retrieve that user's top subreddits by activity. A huge thank-you to Arthur Heitmann and the Arctic Shift project for making this data openly accessible — this extension would not be possible without it.

Note on activity counts: the count shown on each pill represents combined posts and comments the user has made in that subreddit during the configured time period, not posts-only.

FEATURES

• Split-pill badges — each badge shows [subreddit | count] with distinct background colours for the subreddit name and the activity count.
• All subreddits — not limited to any specific community; shows whichever subreddits a user is most active in.
• Sorted by activity — pills are ordered highest-count first.
• Click to search — clicking a pill opens an author-scoped subreddit search (/r/SUBREDDIT/search?q=author:USER) in a new tab.
• Visibility detection — only processes links currently in the viewport; new content loaded by infinite scroll is picked up automatically.
• De-duplication — already-labelled links are skipped; concurrent requests for the same username are coalesced into one.
• Rate-limit handling — respects x-ratelimit-* headers; shows a clickable retry badge when paused.
• 1-week cache (configurable) — user data is cached in chrome.storage.local and only re-fetched after expiry.
• Options page — configure API parameters, pill colours, cache duration, and pause/resume the extension without reloading the page.

OPTIONS
Open the extension's options page (via the browser toolbar or chrome://extensions → Details → Extension options) to customise:

Number of subreddits
Default: 10
How many top subreddits to show per user (1–100).

Time period
Default: Last 6 months
Lookback window for the API query (1 week → all time).

Remember data for
Default: 1 week
How long user data is cached before a fresh fetch.

Subreddit background
Default: #6a5cff
Background colour of the subreddit half of each pill.

Subreddit text
Default: #ffffff
Text colour of the subreddit half.

Count background
Default: #d93900
Background colour of the count half of each pill.

Count text
Default: #ffffff
Text colour of the count half.

Pause / Resume
Default: Running
Temporarily stop annotating links without uninstalling.

A live preview pill updates as you change colours. Click Save to persist, or Reset to defaults to restore all values.