X Mass Blocker

What is this? X Mass Blocker lets you block, mute, or unblock many X/Twitter accounts at once, instead of doing it one by one from each profile page. Paste a list of usernames or numeric X IDs, and the extension works through it in the background while you keep browsing. It also has dedicated tools to pull the retweeters of a tweet, someone's followers/following list, or your own blocked-accounts list — and act on any of them in bulk. Two ways to open it 1. Toolbar icon → quick popup Click the extension's icon in the browser toolbar. A small popup opens right there — a fast way to paste a list and hit start without leaving your page. 2. Icon on the X page → full dashboard tab While browsing x.com or twitter.com, a small round icon floats on the right edge of the page. Clicking it opens the full dashboard in a new tab, with every feature below. Use the popup for quick jobs. Use the full dashboard tab for everything else. If neither a Twitter tab is open nor a connection can be made, the extension now opens a fresh x.com tab for you automatically and continues — no more "please refresh the tab" prompts. Dashboard tabs Mass Block — paste a list (one username or X ID per line), choose Block or Mute as the action, choose username or numeric-ID mode, set a delay between actions, and hit Start. A Preview button shows counts (already done / known contacts / will actually run) before anything happens. Bulk Unblock — paste a list and unblock everyone on it in one go, without fetching your whole blocked list first. Get ID from Username — type a username, get back its numeric X ID (with a one-click copy button). Blocked Accounts — fetches your full list of currently blocked accounts (name, username, numeric ID, bio), with live search, sortable columns, checkbox selection, bulk unblock straight from the table, and CSV export. Retweeters — paste a tweet link and pull the list of accounts who retweeted it (not quote-tweeted). Select any of them with checkboxes and send the selection straight to the Mass Block tab to block or mute. Followers/Following — pull the followers or following list of your own account or any username you choose. Same checkbox-select → send-to-Mass-Block flow as Retweeters. Unfollow History — a permanent log of everyone who has unfollowed you, with the date each unfollow was detected, that you can revisit anytime (see "Unfollow notifications" below for how it's filled in). Clearable from the same tab. Settings — opened from the ⚙️ icon in the header, not a regular tab. Theme, resume-after-refresh behavior, a warning before blocking someone you follow or who follows you, desktop notification on completion, unfollow-notification scheduling, and a whitelist of accounts that should never be touched. A Back to dashboard button returns you to the tabs. Safety features Preview before starting — see how many entries are valid, already done, or known contacts, with nothing actually run yet. Follow-relationship warning — before acting, the extension checks if anyone on your list follows you or is followed by you, and asks you to confirm (per-account) first. This applies automatically to anything routed through the Mass Block tab, including selections sent from Retweeters or Followers/Following. Already-done check — before starting, the extension checks who's already blocked (or already muted, depending on which action you picked) and skips them. Whitelist — accounts you add here are silently skipped, no matter what list you paste. Resume after refresh — if you refresh the X tab mid-operation, the extension picks up where it left off (or asks first, depending on Settings). Final report — a summary panel on the X page shows totals: done, skipped, whitelisted, failed. Unfollow notifications In Settings, you can turn on periodic background checks (every 30 minutes to 24 hours, or a manual "Check now") for who has unfollowed you. This runs from the extension's background service worker — no open X tab required. Each detected unfollow is both shown as a desktop notification (with up to 5 usernames named directly) and permanently saved to the Unfollow History tab.