I would be lost without it as some sites are overly creative with their font display. With that great helper, I am in control of my own screen, (unless Firefox crashes and looses it temporarily) I wish I could save it somewhere... to make sure I always have a copy.
I have awful eyesight, so the ability to make the menu text bigger is pretty handy to me. It does everything it says it does in the description. Thumbs up. I noticed some people saying it zooms the whole page rather than just the text, but that is not the case for me. I checked the image sizes at different zoom levels and they stayed the same for me. So at least in my case, it is working properly.
This is OK, but it just does what Ctrl-+,Ctrl--, and Ctrl-0 do. For those that want to just zoom the fonts (but not the images) try the NoSquint addon. https://addons.mozilla.org/en-US/firefox/addon/nosquint/
1) it makes everything on the whole entire page get bigger when you click on the toolbar icon button, it also offers a button that will double the whole entire page, and a reset button. I believe it's the same thing as if you hit the Cntrl key and the "+" key at the same time to make things bigger.
2) it also offers a toolbar icon button that will increase the size of your Menu Bar font.... i.e., "File Edit History Bookmarks Tools Help" will get much bigger, to see easier.
What i am looking for is an easy one click toggle to change between "Minimum Font Size". Some web pages just don't look right with the font size big, so i need a way to click a toolbar button and have it jump from 20 to 14, and back. (Under Fonts and Colors, click Advanced, and that's where you can set all sorts of font sizes, but it's a pain to do it everytime for one specific page).
This doesn't change the font size of a webpage. It changes the pages Overall, ie fonts and graphics, ZOOM level. Changing font size vs font zoom is not nearly the same thing. If you like the extension I highly suggest checking out nosquint. You can choose per-site settings and also do just Text vs Overall page Zoom.
After installation the three buttons do not appear automatically on the toolbar, but are added to the offer of buttons available for the customization of the toolbar (accessed through View/Toolbars/Customize) from which you then drag them one by one to the desired position on the toolbar. Once there, they function perfectly.