Works well. Just need the top bar of tabs to be hidden.

For anyone having trouble with the horizontal tabs not hiding, Anonymous user 099626's advice worked for me. Create a folder chrome/ in your firefox profile and then in that directory a userChrome.css file containing the following rules

/* Remove horizontal tabs */
#tabbrowser-tabs {
visibility: collapse;
}

If you want to get rid of the sidebar header, add this to the file:

/* Remove sidebar header */
#sidebar-header {
visibility: collapse;
}

You will have to restart Firefox to enact the changes.

Cannot remove tab bar on top anymore.

just got it

Как скрыть вкладки сверху?

Latest update today with the desire for new permissions has caused the addon to fail. Before this I am grateful it was ported over to the new design. This is the main reason I use FF. Please help fix this issue.

Update, just clicked to add again to Firefox and it fixed it. Odd but ieast it is working again.

Best extension ever that keep me using Firefox

Please justify in the description why the permission to access data from websites is required. It could deter people from using your fantastic extension, which would be a shame.

For those interested, justification for website data access permission is given here : https://github.com/piroor/treestyletab/issues/1536#issuecomment-344541809

Requires access to ALL data from websites, read and modify bookmarks, and use notifications... I cannot remotely see why those permissions could be possibly needed...

Requires access to ALL data from websites! I think I'll pass thanks

Must have дополнение для ФФ. Пользуюсь уже много лет.

my only issue (after finding the work abouts for the top bar to go away...is making the tabs "thinner". the one bit of code that was here scrunched it all up and i couldn't make hide nor hair out of my tabs. I suppose screwing around with css and figuring it out is going to be something i'm going to have to do...if only to figure out which tag needs changed to get them thinner without everything running together.

Works in FF57, however have an issue with dragging things (like a text link or an image) to become a new tab on the side, I get jumped to the new tab instead of it loading in the background.

ツリー型タブのアドオンを1年前ほどからずっと入れてましたがFirefoxのアプデにより
ツリーの固定化と最大縮小サイズが狭くなってしまいもっと狭く設定できるようにしてほしいです。
このアドオンを使わないと生きていけない体になってしまい、とても良いアドオンだと思います

Practically essential if you open many tabs. Hierarchical indentation is what makes this superior to all other solutions.

The transition to Web Extensions is excellent considering the situation. There is a current bug on Firefox's end that keeps the horizontal tabs around. You can address this by creating a file in your Firefox profile, \chrome\userChrome.css and add the following rules:

/* Remove horizontal tabs */
#tabbrowser-tabs {
visibility: collapse;
}

If you want to get rid of the sidebar header, add this to the file:

/* Remove sidebar header */
#sidebar-header {
visibility: collapse;
}

You will have to restart Firefox to enact the changes.

I loved having the autohide tabs on the side and no tabs at the top. It was just easier for me when I was search for something, say Thumb drives, and I could easily locate the store page from all the listings I was looking at. The autohide tree tabs on the side gave me more screen space both vertically and horizontally and I miss it sorely. I hope to see this updated soon for ff57!

Auto hide not working in FF57 & display as sidebar! And horizontal tab too displayed.