IIRC, that type of extension hasn't been needed since before Firefox 4 came out. I see that lower-right corner triangle of dots in the Post a Reply where I am typing right now.

And this version - https://addons.mozilla.org/en-US/firefox/addon/resizeable-textarea/ - that I used to use years ago, specifically says - Firefox 4 with build in resizing is out!

Note that is is possible that a website disables this feature via CSS code (textarea{resize:none})

• http://dev.l-c-n.com/form-controls/resize_textarea.html

I really liked it when the resize "grip" appeared a couple of Firefox versions ago.

However, more and more web sites seem to set the CSS style property "resize" to "none" in order to remove the resize grip.

I don't like this idea. I want to be able to resize a text input area whenever I may see fit.

How can I globally disable the "resize" CSS property and get the resize grip back?

You can right-click in the text area and open the Inspector (Firefox/Tools > Web Developer;Ctrl+Shift+I).
Disable the resize:none rule.

• https://developer.mozilla.org/Tools/Page_Inspector

Add code to the userContent.css file.

• http://kb.mozillazine.org/userContent.css

The customization files userChrome.css (user interface) and userContent.css (websites) are located in the chrome folder in the Firefox profile folder.

• http://kb.mozillazine.org/Editing_configuration

textarea { resize: both !important; }