The icon sometimes doesn't appear in the address bar though (apparently because Firefox is unable to identify where the text content is in the page.)
I've also found the extension - Open in Reader View [1] to be useful for those situations.
[1] http://firefox.add0n.com/reader-view.html - Firefox, Chrome and Opera
https://chrome.google.com/webstore/detail/high-contrast/djcf...
The icon sometimes doesn't appear in the address bar though (apparently because Firefox is unable to identify where the text content is in the page.)
I've also found the extension - Open in Reader View [1] to be useful for those situations.
[1] http://firefox.add0n.com/reader-view.html - Firefox, Chrome and Opera