The pop-up cookie window that the about:preferences opens can't be resized manually. It resizes automatically based upon the height of the browser window.

Can't you make this window higher?

The new in-content about:preferences page has replaced the previously used standalone window.

You can toggle browser.preferences.inContent to false on the about:config page to restore the standalone Options/Preferences window that you had in previous Firefox versions.

Firefox’s Redesigned Preferences Feel More like the Web:

• https://blog.mozilla.org/ux/2014/05/firefoxs-redesigned-preferences-feel-more-like-the-web/

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

The blog says "the whole thing is rendered in content space rather than as a separate window". Not exactly true - the cookies window is still a separate window. The previous version had minimize/maximize buttons, but 38.0.1 does not.

I can't seem to leave a comment on this blog post. Does anyone else have this problem?

Toggling "browser.preferences.inContent" fixed it. I'm not sure if the settings will survive the next update.

Thanks, Shane.

The DOM Inspector shows a vbox#dialogOverlay with a groupbox#dialogBox in it. In this box there is a browser#dialogFrame container that has the Cookie manager window. This window is resizable for me if I place the mouse pointer in the bottom right corner. A style rule sets the minimum height and width, so you can't make it smaller than that.

id="dialogBox"
resizable="true"
style="min-width: calc(42px + 36em); min-height: calc(72px + 530px);"

I didn't notice the resize handle. I can make the dialog box a little bit bigger, almost as large as the Firefox window, but I can't maximize it (make it as large as the entire screen).

Am I the only one having trouble trying to leave a comment on the blog post?

Thanks, Shane.

It is a browser window within the current tab, so you can't extent it beyond the width of the current tab. Switching to full screen mode via F11 maximizes the available area.

Thanks.