Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of Demo WebExtension (MV3)

Demo WebExtension (MV3) by sudokucomvn

Quickly toggle a red outline around the current page from the popup. Lightweight, no background process, works only on the active tab; collects no user data.

0 (0 reviews)0 (0 reviews)
No UsersNo Users
You'll need Firefox to use this extension
Download Firefox and get the extension
Download file

Extension Metadata

About this extension
One-click tool to draw a red outline around the current page for quick layout checks, QA, demos, and focus. Runs only when you click the popup, affects only the active tab, and stores no data. No background script, no tracking. No telemetry. Private.
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and dataLearn more

Optional permissions:

  • Access your data for all websites
More information
Add-on Links
  • Support site
  • Support Email
Version
1.0.2
Size
11.33 KB
Last updated
a month ago (Aug 18, 2025)
Related Categories
  • Tabs
License
MIT License
Version History
  • See all versions
Add to collection
Report this add-on
More extensions by sudokucomvn
  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

  • There are no ratings yet

Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.