Extension file:// access

If you open a local Markdown file (a file:// URL) and it stays as plain text, it’s almost always a permissions or trigger issue.

Chrome

1. Open chrome://extensions/.
2. Find Markdown Viewer & Reader → Details.
3. Enable Allow access to file URLs.
4. Reload the tab.

Microsoft Edge

1. Open edge://extensions/.
2. Find Markdown Viewer & Reader → Details.
3. Enable Allow access to file URLs.
4. Reload the tab.

Firefox

1. Open the extension popup.
2. Enable Automatic Preview.
3. If the page still doesn’t auto-render, open the popup and click Preview This Tab.

Also check

• The URL must end in .md or be a README.md.
• If you have another Markdown viewer extension installed, disable it temporarily to test conflicts.

Related:

• Install + setup: Markdown Viewer