Rated 2 out of 5 stars

It is too bad it does not work with local files.

Rated 5 out of 5 stars

I just installed and it works like a charm!

This review is for a previous version of the add-on (1.10). 

Rated 5 out of 5 stars

Nice little add-on. Do exactly what's advertised.

Great addition to Firefox/Iceweasel if you need to visualize Markdown files from ftp servers or http directories.

Only one minor issue: the page title (as displayed in the application title bar) is made of the first characters of the file. With inelegant results when the Mardown file start with an "underline" style header -- in that case, you end up having a bunch of ========== in the title.

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 5 out of 5 stars

Simple, powerful.

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 5 out of 5 stars

Thanks for developing this add-on. This just works and the rendered output is clean!

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 5 out of 5 stars

I'm using on Firefox 41.0.1 and I haven't any problem. Works good, easy and soft.
Thanks for all. :)

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 4 out of 5 stars

There are multiple flavors of markdown syntax. I did not find information about which syntax is supported by the addon, neither on this addon page, nor on the project page. That would be helpful to have.
Andy

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 4 out of 5 stars

For small documentation snippets it is a great tool, better than raw text files, because the relevant constructs are supported and look nice: images, simple tables, code, pre, bold, italic, etc.

It is not so great for bigger documents, as in-document-references are not supported. It autogenerates the ids for the headings ‒ #foo becomes <h1 id="foo">foo</h1> ‒ but it wont generate the href attribute on links ‒ [go to foo](#foo) becomes <a>go to foo</a>. Worse, using raw html links will also not work. From <a href="#foo">foo</a> it removes the href attribute! A workaround to prevent scroll scroll is the HeadingsMap Addon.

Other Issues:
It adds an unnecessary outermost div.container.
The css adds margins on left and right side. This can be fixed by editing the css in the xpi of this extension in the firefox profiles folder).
The title of the tab shows the contents of more than the first line of the md file (eg. '<title>======= loremipsum').

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 5 out of 5 stars

Very useful. No problems on Linux (Kubuntu). I did not have to tweak anything and it works perfect. Thank you!

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 5 out of 5 stars

Works for most .md files. While it might not be perfect, I really admire the great act of filling the vacuum.
@developer
Kindly correct the errors mentioned by someone here. That makes this the one and only addon in its true sense.

This review is for a previous version of the add-on (1.8.1-signed). 

Rated 5 out of 5 stars

5 stars, thanks!

This review is for a previous version of the add-on (1.6.1-signed). 

Rated 4 out of 5 stars

but, This cant convert "`#include &amp;lt;functional&amp;gt;`" into "&amp;lt;code&amp;gt;#include &amp;amp;lt;functional&amp;amp;gt;&amp;lt;/code&amp;gt;"

日本人なので日本語で書きますが、&lt;や&gt;がエスケープされません。これを除けばとても便利なアドオンです。
UTF-8エンコードのテキストファイルを読み込んで見た結果、2バイトでも文字化けしませんし。

This review is for a previous version of the add-on (1.6.1-signed). 

Rated 5 out of 5 stars

5 start for it's the only one I can find that fit me ^_^.

just notice the (for V1.5) in the comment below. Author has relased newer version on github, just follow "Add-on home page" link in the left panel.

For someone who want to update it yourself:
1. Download the xpi file, extract it to a folder
2. Download the latest marded.js from https://github.com/chjj/marked. It's in the lib folder
3. Replace the one in xpi with the latest one
4. Compressed the extracted files to zip and rename it with xpi, then install it.

This review is for a previous version of the add-on (1.3.1-signed). 

Rated 4 out of 5 stars

conflict with add on "right to click"

This review is for a previous version of the add-on (1.3.1-signed). 

It's finally fixed with the last version!

Rated 4 out of 5 stars

The visual flaw here : https://imageshack.com/i/1n3gn0j
.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Shown Script here :

window.oldSetTimeout=window.setTimeout;window.setTimeout=function(func,delay){return window.oldSetTimeout(function(){try{if(!document.documentElement.getAttribute('stopTimers')){if(typeof func=='string') {var nfunc = new Function(func); nfunc();} else func();}}catch(ex){}},delay);}; window.oldSetInterval=window.setInterval;window.setInterval=function(func,delay){return window.oldSetInterval(function(){try{if(!document.documentElement.getAttribute('stopTimers')){if(typeof func=='string') {var nfunc = new Function(func); nfunc();} else func();}}catch(ex){}},delay);};

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This review is for a previous version of the add-on (1.3.1-signed). 

It's fixed in the last version! Iit was caused by an incompatibility woth the add-on "RightToClick"

Rated 4 out of 5 stars

It's simple (nothing's configurable) and gets the job done. The style sheet is fine. And it *can* read local files. So far, so good :)

The only drawback is that tab title is a hard-coded "Markdown Viewer" string. Among all the possibilities I could think of (file path, file name, first line, first title... or a combination of those) that's probably among the less useful.

This review is for a previous version of the add-on (1.3.1-signed). 

Rated 4 out of 5 stars

Work on WinXP Pro SP3

This review is for a previous version of the add-on (1.3.1-signed). 

Rated 5 out of 5 stars

I find it, and it`s work on Firefox 24 x Ubuntu 12.04.3 (GNU/Linux).

If there is not yet an existing RDF node for 'text/plain' add it, and add "md" as a file extension.

$ vi ~/.mozilla/firefox/*default/mimeTypes.rdf
......
<RDF:Description RDF:about="urn:mimetype:text/plain"
NC:value="text/plain"
NC:fileExtensions="md"
NC:description="Text Document">
<NC:handlerProp RDF:resource="urn:mimetype:handler:text/plain"/>
</RDF:Description>

----
Getting Markdown Viewer To Display HTML Formatted Markdown Content in Firefox Under Linux
- http://www.ryanchapin.com/fv-b-4-737/Getting-Markdown-Viewer-To-Display-HTML-Formatted-Markdown-Content-in-Firefox-Under-Linux.html

This review is for a previous version of the add-on (1.3.1-signed). 

Rated 1 out of 5 stars

Cannot be used to view files on local filesystem -> primary use case FAIL.

This review is for a previous version of the add-on (1.3.1-signed). 

Rated 5 out of 5 stars

Great little extension (and the workaround for Linux users for .md files https://addons.mozilla.org/en-US/firefox/addon/markdown-viewer/reviews/423328/ works nicely).

This review is for a previous version of the add-on (1.3.1-signed).