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background.js
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background.js
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var options = [
'frontPageFeed',
'relatedSidebar',
'relatedEnd',
'comments',
'liveChat',
]
var registered = null
async function getCssToActivate() {
var results = await Promise.all(options.map(async function (option) {
var res = await browser.storage.local.get(option)
var toggled = res.hasOwnProperty(option)
? res[option]
// default any option to true if it is not set yet
: true
return [ option, toggled ]
}))
var filtered = results.filter(function (res) {
return res[1]
})
var css = filtered.map(function (res) {
return {
file: './styles/' + res[0] + '.css',
}
})
return css
}
async function registerScript (message) {
// in case any other extensions message this extension by accident
if (message !== '__reloadYtCSS') {
return
}
// reset any previously registered CSS
if (registered && typeof registered.unregister === 'function') {
registered.unregister()
}
var css = await getCssToActivate()
registered = await browser.contentScripts.register({
matches: [ '*://*.youtube.com/*' ],
css: css,
runAt: 'document_start',
})
}
async function init () {
// ensure that the options are activated on install and when browser starts
await registerScript('__reloadYtCSS')
}
browser.runtime.onMessage.addListener(registerScript)
browser.runtime.onInstalled.addListener(init)
browser.runtime.onStartup.addListener(init)