Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Blank "notch" in upper left corner

NightWalker
NightWalker
more options

Since the Quantum update, there has been a blank "notch" in the upper left corner of my browser window. It's just a blank space to the left of my leftmost tab and above the "back" button. I'd like to move my tabs to the left to fill in this space. I sometimes have a lot of tabs open and like to be efficient with my use of space.

Thank you.

Since the Quantum update, there has been a blank "notch" in the upper left corner of my browser window. It's just a blank space to the left of my leftmost tab and above the "back" button. I'd like to move my tabs to the left to fill in this space. I sometimes have a lot of tabs open and like to be efficient with my use of space. Thank you.

All Replies (1)

herve.legrand
herve.legrand
more options

First you have to create userChrome.css file. Here is the guide:

https://vimeo.com/241645477

Then paste this text into userChrome.css, save the file and restart Firefox: 

#TabsToolbar {
  padding-top: 0px !important;
}

.titlebar-placeholder[type="pre-tabs"] {
  display: none !important;
}

Modified by herve.legrand