Mozilla working to bring Reader mode in Firefox for Android to desktop version it has now reached alpha stage, team working on this project showed demo through a video. With Reader mode you can view and read articles in minimalist UI without any distracting elements on screen in Firefox.
Here is how Reader mode in desktop Firefox supposed to work and its progress so far
If a page detected as reader-friendly then Reader icon (book) will appear in location bar which when clicked pop up window comes up and that window will be filled with article content on same tab stripping out unnecessary elements on page. User can navigate back to original article by click on back button.
Reader mode has dedicated about:reader page which loads page content when user clicks on Reader button. This page allows user to change font, text sizes and offers dark and light modes for reading.
Reader mode has a preference reader.enabled which when turned on always shows the reader button on location bar. Reader mode for Firefox using same font OpenSans which mobile version uses.