chrome.tabs.onActivated.addListener((activeInfo) => {
    chrome.tabs.query({
        active: true,
        currentWindow: true
    }, tabs => {
        const supportedUrls = [
            'medium.com',
            'youtube.com',
            'github.com'
        ];
        
        let supportedSite = false;

        for (const i in supportedUrls) {
            //console.log(supportedUrls[i]);
            const pattern = new URLPattern({ hostname: `{*.}?${supportedUrls[i]}` });
            console.log(tabs[0].url);
            supportedSite = pattern.test(tabs[0].url);
            if (supportedSite) {
                break;
            }
        }

        if (supportedSite) {
            chrome.action.setBadgeText({text: ':o'});
            chrome.action.setBadgeBackgroundColor({color: "#8F8"});
        } else {
            chrome.action.setBadgeText({});
        }
    });
});