新版更新後。
不具合多数。

新規タブ：
白背景＋白文字
暗い壁紙＋黒文字
視認不可能。

外観スキン：
無彩色であるべきところに色相と彩度が入る。
ホワイトバランスがとれない。
明暗差がない→形がわからない。
ＯＳ＝ライトモード、Firefox＝ダークモード、Firefoxの内側が黒、外側が明るい灰色、これができなくなった。

タブグループ：
彩度が高い。目が痛い。
近似色が３つ４つある。

開発者は外観変更で遊ばないでください。

良い例：
テレビの外側（黒）
MacOS 7.6〜9、10.0〜10.7
マリオペイント
車の運転座席

All I want is a theme with a vaguely dark unobtrusive colour which (and here's the kicker) doesn't have a DRASTIC gradient from one side to the other! I don't even mind the rounded edges _that_ much in comparison to the hideous gradients or forced colours.

Forced rounded edges everywhere with no option to toggle it in order for FF to look like it used to.

bad

looks cheap, like all of the UI refreshes

Horrible design, difficult to read, change it back to the way it was before

gradient pos made by someone with absolutely no taste who should only be relegated to flipping burger patties

I want the old design back

WHYYYYYY? wtf is this rounded corners BS. It cant be changed WHYYYYYYYYYYYYYYYYYYYY

Why ? Why ?
New update is more personnalisation, which is good.
But why not letting us stick to the old experience ?
Why not let us have the dream of stable visual ?
Why not let us the nostalgia of the blocky apparence ?
Why not let us have the right to choose ?

gradient? rounded corners? no

Theme is ok, but I can't get rid of the dark backgound in blank Private windows (I'm using Light interface). Got rid of the dark title bar (via browser.theme.dark-private-windows set to false), but the background still dark..

I love this update, my issue is lack of customization, ash in my opinion is the best, but having the option to pick the starting color (coming to left) and the end color (going to right) would be amazing, i'd love to try picking green for left and black or a gray for right, it'd look so cool.

Everybody should try Matte Black by Elijah Lopez. It feels fairly close to my previous experience before the horrible rounded edge update.

Mozilla -- please make it easy for us to disable the rounded edges. I am guessing these UI elements are parametric and that there's a radius option internally. Expose that in the themes and give us more control by default so that we don't have to deal with manually editing .css files or other tinkering.

Give people a choice without the gradient!

The gradient looks terrible. Just make a dark theme please.

stop forcing my browser to look different. i want the default dark mode from 12 hours ago. no ugly widgets (that you keep making me turn off again every other month btw) on the home screen, no gradients or rounded edges. i want boxes and a single boring dark color back

nobody wants the gradient. it is ugly and distracting. mozilla ui refreshes are the worst