change font size instantly
italic text windows had an index that allowed instant change of fonts baed on percent change desired.
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Hi enthalpy1,
You can try using Zoom. This will increase/decrease the size of everything on the page. You can try hitting CTRL and + a few times to try it out. CTRL and 0 will return it to normal size.
If that isn't what you are looking for you, you might want to look into some of the Accessibility features in Firefox - Make Firefox and web content work for all users options. There is lots of good information in that article.
Hopefully this helps!
There is a +- Zoom button in the Customize Palette that you can move to a toolbar.
https://support.mozilla.com/en-US/kb/How+to+customize+the+toolbar
http://kb.mozillazine.org/Toolbar_customization
You can use an extension to set a default font size and page zoom on web pages.
- Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
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