How do I get rid of the spinner that appears on the left side on the tabs?

Question

(Firefox 25.0.1, Windows 8)
There's a little green spinner that appears to the left of "Connecting..." on the tabs while loading a page. Any way to get rid of it? It's been quite annoying me for a while.

Answer 1

You can manually create/edit the userChrome.css file. Here's how.
(1) Find (or create) the chrome folder. This is a folder in your currently active Firefox settings folder, also known as your Firefox profile folder.
* Open the your profile folder using: Help > Troubleshooting Information
** Windows: Click the "Show Folder" button
** Mac: Click the "Show in Finder" button
* Check for a chrome folder.
** If it exists: double-click it to open it.
** If it does not exist: create a chrome folder, then double-click it to open it.
(2) Create or Edit a userChrome.css file by adding your style rule.
* Check for a userChrome.css file in the chrome folder.
** If it exists: open it in a text editor. Check that it has this first line:<br><br>@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);<br><br>Then add the following lines and save the file:<br><br>.tab-throbber { display: none !important }<br> &nbsp;
** If it does not exist: create a new text file named userChrome.css. (In Windows, right-click and choose New > Text Document and change the name to userChrome.css.) Then see the previous step for what to place in the file.
The rule change should take effect the next time you start Firefox.
Note: I find it easier to use the Stylish extension, but if you don't want yet another extension, then userChrome.css makes the most sense.