Simply space. But dark.
Link to image source:
https://i.imgur.com/GCJRhiA.png
UPDATE: Changed color of background tabs…
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manifest.json
{
"update_url": "https://clients2.google.com/service/update2/crx",
"manifest_version": 2,
"theme": {
"images": {
"theme_frame": "images/theme_frame.png",
"theme_toolbar": "images/theme_toolbar.png",
"theme_tab_background": "images/theme_tab_background.png",
"theme_ntp_background": "images/theme_ntp_background.png"
},
"colors": {
"frame": [
66,
116,
201
],
"toolbar": [
0,
0,
0
],
"tab_text": [
255,
255,
255
],
"tab_background_text": [
252,
252,
255
],
"bookmark_text": [
255,
255,
255
],
"ntp_background": [
0,
0,
0
],
"ntp_text": [
255,
255,
255
],
"button_background": [
0,
0,
0,
0
]
},
"tints": {
"buttons": [
0,
0,
1
]
},
"properties": {
"ntp_background_alignment": "bottom",
"ntp_background_repeat": "no-repeat"
}
},
"name": "Dark Space",
"version": "2",
"description": ""
}