Patching to minimalist Vivaldi

gistfile1.txt

Update {Current Version Number} as applicable

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Create /Applications/Vivaldi.app/Contents/Versions/{Current Version Number}/Vivaldi Framework.framework/Resources/vivaldi/style/custom.css
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/* Remove unnecessary buttons from address bar */
.button-toolbar.home { display: none }
.button-toolbar.reload { display: none }
.button-toolbar.back { display: none }
.button-toolbar.forward { display: none }

/* Remove unncessary buttons from tab bar */
.button-tabbar.newtab { display: none }
.button-tabbar.toggle-trash { display: none }
.add-bookmark-container.addressfield-popup-container { display: none }

/* Hide window controls */
#browser.mac .window-buttongroup { display: none }

/* Reduce top and side padding for tabs */
#tabs-container.top { padding-top: 2px  }
.mac #tabs-container.top { padding-left: 2px }

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In /Applications/Vivaldi.app/Contents/Versions/{Current Version Number}/Vivaldi Framework.framework/Resources/vivaldi/browser.html
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Add after line 6: <link rel="stylesheet" href="style/custom.css" />