v4.0.0-beta.3

[jdev082]

fix: move toggling visbility to its own function
feat: add back backend functionality for custom user agents
feat: add frontend option for custom user agent
feat: change titlebar color to match general colorscheme
fix: tweak color shades for better contrast
feat: move and recategorize options + preferences improvements
fix: fix bug where search suggestions didn't open the page

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This discussion was created from the release v4.0.0-beta.3.