Offline Mode
Offline Mode disconnects the browser from the internet through a browser add-on.
About Offline Mode
Offline Mode is a browser add-on that disconnects the browser from the internet. A toolbar button turns it on or off; while active, it blocks internet requests and redirects pages to a local Offline Mode screen. It is intended for web developers testing an add-on without a connection and is available for Firefox, Chrome, Edge and Opera on desktop and mobile.
Pricing is not clearly stated.
Key features
- Toolbar button switches the add-on on or off; the icon is dark grey when active and light grey when inactive.
- Blocks all internet traffic, including background activity such as service workers and WebSocket.
- Redirects websites to a local Offline Mode page with a Go back button.
- No options or settings page, and no option to customise the offline page.
- Runs in Firefox, Chrome, Edge and Opera on desktop and mobile.
Best for: Web developers testing an add-on without an internet connection.
Watch out for
- Blocks every tab, so it cannot be used to take only selected sites offline.
- On mobile, the popup interface may not fit the screen.
- The add-on must be turned off before using the Go back button.
Offline Mode at a glance
- Category
- Software & Utilities › Browser Extensions
- Type
- App
- Pricing
- Not confirmed. Check the site
- Platforms
- Browser extension
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Browser Extensions
Offline Mode alternatives
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