Meta Viewport Adder adds the <meta name="viewport"> tag with the basic values width=device-width and initial-scale=1.0 of the content attribute. This allows sites to fit the width of the device and have a standard zoom.

Why is it only added to sites that don't have it?
Because it could generate unwanted changes in the interface of a site that already has a different setting.

If you want to check the source code, you can find it on GitHub.

Install

• License: MIT License
• Weekly downloads: 1
• Average daily users: 3
• Rating: 4/5 of 1 ratings
• Created: 2021-03-22 06:41:41
• Last updated: 2021-04-11 01:05:20
• Homepage: https://github.com/imheinrichlunge/meta-viewport-adder
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/meta-viewport-adder/
• API: {fdcdd96f-0e62-4d99-8530-24e7660ec3a0}