Adding link to colorful theme https://addons.mozilla.org/en-US/firefox/addon/firefox-alpenglow/, that should be pre-installed in firefox. Scope of this bug is to pre-install this new theme in firefox similar to https://searchfox.org/mozilla-central/source/browser/components/BrowserGlue.jsm#1275 and display it as fourth option in 'Choose a look' screen in onboarding flow. Onboarding flow can retrieve this pre-installed theme using AddonManager.getAddonByID method https://searchfox.org/mozilla-central/source/browser/components/newtab/aboutwelcome/AboutWelcomeParent.jsm#197
Bug 1643776 Comment 5 Edit History
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Adding link to colorful theme https://addons.mozilla.org/en-US/firefox/addon/firefox-alpenglow/, that should be pre-installed in firefox. Scope of this bug is to pre-install new theme in firefox - https://searchfox.org/mozilla-central/source/browser/components/BrowserGlue.jsm#1275 and display it as fourth option in 'Choose a look' screen in onboarding flow. Onboarding flow can retrieve this pre-installed theme using AddonManager.getAddonByID method https://searchfox.org/mozilla-central/source/browser/components/newtab/aboutwelcome/AboutWelcomeParent.jsm#197