Minimum Font is an extension which I created for Google Chrome (and Chromium, the open-source bit of Chrome) in light of the fact that there is no way to set the minimum font size for Web sites in Chrome. Of course, after making it I discovered that there is a way, but you must edit a configuration file (which some or most users won't want to deal with); there is also an issue filed on the Chromium bug-tracker, for those who are interested in seeing what's being done (Only useful comments, please, and star the issue if you would like to have updates mailed to you or to show your support).
I'm still maintaining the extension, so if you encounter any pages which the extension doesn't work on, or you have a fix for an issue you've encountered, please leave a comment here or on the extension's gallery page and I'll see what I can do to fix it.
Currently, the font size for
<body>, <div>, <font>, <span>, <pre>, <p>, <a>, <h1>, <h2>, <h3>, <h4>, <h5>, <legend>, <label>, <td>, and
<th> tags are checked. Additionally, you may separately choose the size of <small> and <textarea> elements, and enable or disable their minimum setting if you like, as well as disable or enable Minimum Font on individual sub-domains by clicking on the pageaction.