The latest stable releases of Chrome, Firefox, and Opera are supported.

Looking for a working, maintained version of 4chan X?

Install Appchan X

Chrome:

Install Appchan X. That's it.
Appchan X will be automatically updated by Chrome.

Firefox:

If you don't have Greasemonkey installed:
1. Install Greasemonkey.
2. Restart Firefox.
Install Appchan X.

Opera:

If you don't have Download Chrome Extension installed:
1. Install Download Chrome Extension.
Install Appchan X.
Appchan X will be automatically disabled by Opera because it's considered a "Third Party Extension". Open the opera://extensions> page and manually enable it.

Enhancing
- Toggleable Catalog Links
- External Catalog Support
- Archive Redirection for 404'd Threads
- Customizable Keybinds
- Time Localization + Custom Formatting
- Custom Formatting for File Information
- Comment & Thread Expansion
- Index & Reply Navigation
- Styles and Theming
- Custom Navigation
- Ban Checking
- Custom CSS
- Emoji
- Scrolling to The Bottom of The Page Fetches The Next Page
- /f/ Sauce Check
Linkification
- Clickable Links
- Video/Audio Link Embedding & Titles
Filtering
- Anonymizer
- Regular Expressions Based Filter
- Thread & Reply Hiding
- Optional Stubs
Imaging
- Image Expansion
- Image Fit: Full, Width, Height or Screen
- Image Reload on Loading Error
- Image Hover
- Customizable Sauce Links
- Reveal Spoilers
- Image Prefetching
- Remove Posts Without Images
- Higher Quality Thumbnails
- Animated GIF Thumbnails
Menu
- Drop-down Menu
- Report Link
- Delete Link
- Download Link
- Archive Link
- Embed Link
- Thread & Reply Hiding Link
Monitoring
- Fully Customizable Thread Updater
- Auto-Scroll to New Posts
- Unread Count with Customizable Favicon Indicators
- Post In Title
- Identify Quotes That Quote You
- Alerts When Posts Quote You in Title
- Thread Stats
- Merged Updater & Stats
- Thread Watcher With 404 Notifications
- Auto Watch on Thread Creation & Reply
- Color User IDs
- Marked Own Posts
- Remove & Indicate Spoilers
Posting
- Quick Reply
- Image and Text Dumping
- Multiple File Selection, Drag and Drop Files and Thumbnails
- Thread Creation with Auto-Noko
- Detect and Prevent Upload Failures
- Automatic Quote from Text Selection
- Auto-Hide
- Cooldown
- Auto-Posting
- Captcha Caching with Shift + Enter
- Captcha Reloading on Backspace
- Persistent QR
- Remember QR Size, Name, E-Mail, Subject, Image Spoiler, and Sage
- Per Board Personas
- Markdown
Quoting
- Quote Backlinks & Custom Formatting
- Quote Inline
- Quote Hash Navigation
- Quote Preview
- Quote Highlighting
- Resurrect Dead Quotes from Archives
- Indicate OP Quotes
- Indicate Cross-thread Quotes
- Forward Hiding
Styling
- Interface
  - Single or Multi-column menu interface.
  - Configurable sidebar position and size
  - Thread Padding
  - Configurable dialogs for announcements, thread watcher, updater, and slideout navigation
  - Configurable icons
- Posts
  - Alternate reply colors
  - Additional coloring options for file info and reply headings
  - Configurable backlink positions
  - Sage Highlighting and Emoji
  - Options for reply spacing, padding, and widths
  - Configurable layering options for expanded images
- Aesthetics
  - 4chan Style Script Navigation and Sidebar emulation
  - Ad Blocking, shrinking, and transparency
  - Optional glowing sidebar elements
  - Optional circle checkboxes
  - Custom CSS, with examples
  - Additional Emoji configuration options
  - Font configuration
  - Optional shadows for quote previews and inlined posts, rounded edges, slideout transitions, and link underlines
  - Options for separate themes for SFW and NSFW boards
- Mascots
  - Option to disable
  - Configurable positions and starting locations
  - Options to overlap posts, apply greyscale and silhouette filters, hide on catalogs, or add transparency
  - Options for separate mascots on SFW and NSFW boards
- Navigation
  - Postions and alignment for board navigation and pagination
  - Optionally remove non-link text

Post Form
- Compact and expanded post form options
- Various styles, including slideout, fixed, faded, and floating
- Toggleable "show post form" button
- Smart Tripcode Hider
- Optional decorations and captcha opacity