How to Make Side Panel Resizable [Instructions]

[Anduril97]

How to make side panel resizable: Updated instructions for Feb 2024 (I'm on Firefox version 123)

• Go to about:support

• in Application Basics section find row called Profile Directory, click on Open Directory button

• Close all firefox running instances

• In that folder, find xulstore.json and open it with a text editor

• Find where it says "sidebar-box":{

• inside those brackets look for "style":

• inside this find width: and replace with the following: width: 50%; max-width: none !important; min-width: 0px !important;

• if you did it correctly it should look like this: "style":"-moz-box-ordinal-group: 3; order: 1; width: 50%; max-width: none !important; min-width: 0px !important;","checked":"true"

• save the file and close, open Firefox and enjoy!

[NoahTheDuke]

This doesn't seem to work, sadly.

[jaredhirsch]

Thanks for the suggestion. A note of warning: the XUL Store is where Firefox stores the sidebar's width at shutdown, so that it's restored to that same width on the next session. However, userChrome.css is a better solution here, as it's designed to allow a user to make permanent changes to how Firefox is styled. There are a number of explainers around the web on how to remove the sidebar's width limit by adding CSS rules, for instance, https://superuser.com/questions/1276800/customize-the-maximum-width-of-the-firefox-sidebar.