I appreciate all the hard work that goes into Firefox, and I know design changes receive lots of deliberation. I am therefore a little confused by the upcoming removal of lines between tabs in the Photon redesign (image taken from a Bugzilla attachment):
Without the lines, the tabs seem to blur together and it gets a lot more difficult for me to use. I have been using and advocating for the use of Firefox for over ten years, and it is hard for me to understand why such a change would be made. Would it be possible for anyone to link to some discussions or design justifications about this change? Thank you.