I recently had two conversations with Firefox users who did not know that Firefox came with the means to zoom in and out of a website. They were using external applications to magnify parts of the screen and where surprised that they could achieve the same effect natively in the browser as well.
All of the zooming options are available from the View menu in Firefox. Firefox users find options to zoom in, zoom out and restore the default level in the Zoom submenu there.
Note: The menu bar is not displayed anymore by default in newer versions of Firefox. You can tap on the Alt-key on your keyboard to bring it up, so that you can access the View menu and its zooming options.
There is also one additional option to change the default zoom behavior to only zoom the text of a website. The default behavior is to zoom all elements of a website. Not many users will use the View > Zoom menu though to zoom in Firefox. It simply takes to long which is why the same effect can be achieved with keyboard shortcuts:
The keyboard shortcuts come in really handy if you stumble upon badly designed websites or those that use images or other elements that are barely decipherable in default view. The only thing that one should realize is that the zoom level works on a domain basis. Multiple pages of the same domain that are opened in different tabs will all be effected by the zoom.
You can also add zoom control buttons to Firefox's interface. The easiest option to do so is to press Alt to bring up the main toolbar, and select View > Toolbars > Customize from it.
You need to locate the Zoom Controls button which you can drag and drop to a Firefox toolbar so that it becomes available there permanently.
Update: Firefox users can also install the Firefox Mouse Zoom extension which adds page zooming options for the mouse. It furthermore allows users to change the default zoom levels, for instance to make them more granular or increase the maximum zoom level available. The maximum zoom level is 300%, the minimum 30% which should be enough for all websites. A right-click on the page and the use of the mouse wheel zooms in or out of the active page.
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