Does firefox has built in screen reader
My eye sight is bad is their any way to make the letter larger . With internet explore you can in large the content.
Opaite Mbohovái (3)
You can use the NoSquint add-on to make the text larger on all sites.
Also see Default FullZoom Level: https://addons.mozilla.org/en-US/firefox/addon/6965
With Default FullZoom Level you can zoom only the text or everything on the page from an "icon" in the Status Bar at the bottom of the Firefox window. You can also set a minimum zoom percentage for all pages.
More info about NoSquint recommended by TonyE: http://urandom.ca/nosquint/
Also see information about Firefox's built in zoom:
See also http://www.accessfirefox.org/ - Access Firefox Because the Internet is for everyone.