Support Volunteers can't make changes to Firefox and the developers do not directly monitor this site. To submit suggestions for new or changed features, may I suggest:

Feedback: https://qsurvey.mozilla.com/s3/FirefoxInput/ Facebook: https://www.facebook.com/Firefox Reddit: https://www.reddit.com/r/firefox/ Twitter: https://twitter.com/firefox

There also is a forum run by the Add-ons team where you may see talk about potential future capabilities of extensions to modify the UI (initially limited to colors, I think, but perhaps more down the road): https://discourse.mozilla-community.org/c/add-ons

Please let us know if this solved your issue or if need further assistance.

hi, webextensions can no longer arbitrarily customize the UI in the new addon system. you can however twek most of the stuff with the help of a userChrome.css file - https://www.reddit.com/r/firefox/comments/6x2tmz/can_i_have_tabs_on_bottom_and_bookmarks_above/ contains a sample for tabs on bottom.

@pkshadow - thanks, I will go through that route.

@philipp - that doesn't seem to work. Maybe userChrome.css isn't supported under Quantum?

userChrome.css modifications continue to work fine with firefox quantum. the author of classic theme restorer has also made a bunch of them available at https://github.com/Aris-t2/CustomCSSforFx

Hmmm, OK I'll fiddle, it's not making any change for me; at least the thing I followed on Reddit didn't, but the github thing looks like I need userChrome.css and userContent.css, not just userChrome.

I'll play around and see what I can do.

Still, I think Mozilla should make this easier; to develop a cross-platform browser and then force it to only work a certain way is (IMO) not a very Mozilla-like attitude!

Ah ha! Thanks - got it working now.

Such a simple question, and so annoying that the very latest Quantum doesn't allow you to change the position of the tabs! So frustrating - and I'm certainly not going to bother fiddling around with the suggested solutions. So I'll have to move to Chrome. Very annoying

couldn't agree more with everyone - especially for those of us who are ot at all computer savvy. So far I have followed about ten sets of directions to set up this chrome file and STILL am unsure what to do. Do I copy and paste something into it? How? Does it have to be a notepad file, or do I just copy and paste some text that I get from somewhere? MOST OF US do not understand what to you guys is very simple.

Yes, once again the Firefox developers show that they have not yet realised that Firefox is no longer a niche browser used by computer literate enthusiasts but a main stream browser used by the general public who are mainly not computer literate enthusiasts.

More than that, the layout of the screen defies standard logic. How do you search? You go from the general to the particular. So the screen layout should reflect that - i.e. search bar (the general, it's blank so you can enter in whatever you want to search for, you can't get more general than that), then open tabs (becoming more particular now), then the screen of the tab you are looking at.

Add to this lack of logical layout the fact that the tabs are black with white print and, I think, smaller, make the screen still less user friendly. The standard of dark print on a light (usually white) background is used because that is, for the very great majority of the population, the best combination.

And the oft-repeated statement that Firefox developers rarely if ever look at this forum just confirms that they couldn't really care what problems they inflict on Firefox users.

For all those others who come searching for this:

Press Windows button and R on keyboard Type %appdata% Click OK Find: Roaming>Mozilla>Firefox>Profiles>(alphanumeric mix).default>chrome chrome folder may need to be created.

Open notepad Type in the text in the image: (I tried putting the raw text here, but it changed on saving)

In the save, set to "all files" Save somewhere as userChrome.css Cut and paste it into that chrome folder Restart Firefox. Tabs should now be on bottom.

Re: alancsalt 11/18/17, 3:10 PM

This worked for me!

Followed your instructions exactly.

A million thanks !!

-- DJ

alancsalt said

For all those others who come searching for this: Press Windows button and R on keyboard Type %appdata% Click OK Find: Roaming>Mozilla>Firefox>Profiles>(alphanumeric mix).default>chrome chrome folder may need to be created. Open notepad Type in the text in the image: (I tried putting the raw text here, but it changed on saving) In the save, set to "all files" Save somewhere as userChrome.css Cut and paste it into that chrome folder Restart Firefox. Tabs should now be on bottom.

I've tried this but it all grinds to a halt when I get into the Profiles folder as there is no (alphanumeric mix).default folder.

It's the only folder in my Profiles folder.

Do you not have a Firefox account perhaps?

Hm, maybe I'm thick, but that says gvivfrb7.default, not (alphanumeric mix).default, or are we entering here into the world of computerism in an extreme form?

Those letters/numbers at the start of the folder name are different for everybody.

gvivfrb7 is an alphanumeric mix.

If you have a folder in profiles, whose name ends in .default, that is it.

Thanks for the clarification, as I thought, entering into the deeper world of computerism.

I had already worked out that the file concerned had a unique name for each user, but not that that was the file. I had assumed that the information you gave was the filename and not the file name type. I do, indeed, recall alphanumeric values from my use of Cobol 40 years ago!

Once again, there is a need to remember that not all who use Firefox or visit this forum are computer experts. It would have been clearer if you had simply referred to "the file ending .default".

However, I have made the suggested changes but the tabs are still at the top. In the text to type, it is not always clear where there is a space between characters. Could you clarify, please?

You know what we all need? A guide listing what a layperson can do / change using about:config. Line by line, what is changeable and what each command will result in.

I bet someone could sell that and make some money.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

Anaya said

You know what we all need? A guide listing what a layperson can do / change using about:config. Line by line, what is changeable and what each command will result in. I bet someone could sell that and make some money.

Exactly, and we also need non-computer specialists being involved in development of Firefox. Currently, the development of Firefox is largely, if not entirely, developer-driven and their needs (as they see them) and the needs of what I shall call everyday users can and do diverge widely.

This is the actual code: copy and paste it. It works for me. If it doesn't for you, I don't know why not.

#TabsToolbar { -moz-box-ordinal-group: 2; } 
#nav-bar{ border-top-width: 0px !important; }