Very good!
I have installed it on Firefox and Edge ,it well !

On Firefox, you need to do an extra security step before you can use it(Firefox require).

And before use it, you should uninstall any other markdown extensions.

Finally, thanks agian to the author Simov.

Works great if you configure it properly on Linux using this guide: https://github.com/simov/markdown-viewer/blob/main/firefox.md. If you using Ubuntu probably you have the snap version. In that case in about:config (following the steps on the previous URL) on Firefox be sure to put the full path of the mime file avoid using ~ character. And after that if the addon is not rendering properly the md files, then go to the advanced options of the addon and give the necessary permissions on file access and site access. The addon is great but this process complicate things. However it is worth it!

Does not work in ubuntu 22. Extension reports that it can't read (or change) data from local files

Works great after this workaround: https://github.com/Cimbali/markdown-viewer#support-for-local-files-on-linux

It doesn't support tables!

Лучшее расширение для MD, на мой взгляд

Does what it says on the tin for the most part, doesn't display tables from Reddit correctly though.

My first impression was that it was useless, because it states file:// URLs aren't supported. The docs on GitHub talk mainly about Chrome and the video has no sound, so I didn't find the workaround that somebody else posted in a comment. Here's the fix: https://superuser.com/questions/696361/how-to-get-the-markdown-viewer-addon-of-firefox-to-work-on-linux/1175837#1175837

The fact that this isn't clear in the instructions seems a pretty scathing oversight.

Anyhow, once I added the MIME type, it started working pretty well.

It lacked a bit of detail to set the Markdown title to the tab's title when the file was loaded.

Rating 1 star because of permissions, this plugin should not require access to all data on all websites.

works great in chrome, but apparently does not support in firefox 77.0.1, i want to use this amazing dark themes in firefox, pls fix it

It's an excellant addon,but the support of printing page is poor .the page rendered by this plugin can not be printed completely.

这个扩展很好用，但是对打印的支持不尽如人意。这个插件渲染的页面无法被完整地打印。

Great, but Table of Contents sorely needs a dark option.

The same problem with the plugin on KDE. In spite of the [MIME solution by Firefox user 15126385](https://addons.mozilla.org/en-US/firefox/addon/markdown-viewer-chrome/reviews/1453572/) works perfectly, I have to refresh the page or change any of settings to see the content instead of blank page.

Plugin v. 3.8
Firefox v. 74.0

P.S. That solution for KDE should have appearance in the Documentation.