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Test Info:

function test() {
waitForExplicitFinish();
(async function () {
let testPage =
// eslint-disable-next-line @microsoft/sdl/no-insecure-url
let tab1 = BrowserTestUtils.addTab(gBrowser);
await FullZoomHelper.selectTabAndWaitForLocationChange(tab1);
await FullZoomHelper.load(tab1, testPage);
let tab2 = BrowserTestUtils.addTab(gBrowser);
await FullZoomHelper.load(tab2, testPage);
await FullZoom.enlarge();
let tab1Zoom = ZoomManager.getZoomForBrowser(tab1.linkedBrowser);
await FullZoomHelper.selectTabAndWaitForLocationChange(tab2);
let tab2Zoom = ZoomManager.getZoomForBrowser(tab2.linkedBrowser);
is(tab2Zoom, tab1Zoom, "Zoom should affect background tabs");
Services.prefs.setBoolPref("browser.zoom.updateBackgroundTabs", false);
await FullZoom.reset();
gBrowser.selectedTab = tab1;
tab1Zoom = ZoomManager.getZoomForBrowser(tab1.linkedBrowser);
tab2Zoom = ZoomManager.getZoomForBrowser(tab2.linkedBrowser);
isnot(tab1Zoom, tab2Zoom, "Zoom should not affect background tabs");
if (Services.prefs.prefHasUserValue("browser.zoom.updateBackgroundTabs")) {
Services.prefs.clearUserPref("browser.zoom.updateBackgroundTabs");
}
await FullZoomHelper.removeTabAndWaitForLocationChange(tab1);
await FullZoomHelper.removeTabAndWaitForLocationChange(tab2);
})().then(finish, FullZoomHelper.failAndContinue(finish));
}