Replacement for Chrome Extension's Inline-Install

background.js

var appDomainURL = "*://app.owlandscroll.com/*";
var appDomainURLCononical = "https://app.owlandscroll.com";

const makeAppActive = () => {
  chrome.tabs.query({ url: config.appDomainURL }, tabs => {
    if (tabs.length) {
      var tab = tabs[0];
      chrome.tabs.sendMessage(tab.id, { sendingUserToApp: true }, function(
        response
      ) {
        console.log(response);
      });
      chrome.tabs.update(tab.id, { selected: true });
    } else {
      chrome.tabs.create({ url: appDomainURLCononical });
    }
  });
};

/*
 * Inject content scripts when the user installs the extension so the user doensn't have to refresh the page
 */
chrome.runtime.onInstalled.addListener(function() {
  //Get content scripts from manifest
  chrome.manifest = chrome.app.getDetails();
  var scripts = chrome.manifest.content_scripts;
  var appTab;
  // Loop through all tabs of all windows...
  chrome.windows.getAll({ populate: true }, function(windows) {
    windows.map(function(window) {
      window.tabs.map(function(tab) {
        // ...loop through all content scripts urls matches...
        scripts.map(function(script) {
          script.matches.map(function(scriptUrl) {
            // ...if the tab url matches a content script url...
            if (tab.url.match(scriptUrl)) {
              // ...inject all javasScripts from the content script into the tab...
              if (script.js) {
                script.js.map(function(javasScript) {
                  chrome.tabs.executeScript(tab.id, { file: javasScript });
                });
              }
              // ...inject all css from the content script into the tab
              if (script.css) {
                script.css.map(function(css) {
                  chrome.tabs.insertCSS(tab.id, { file: css });
                });
              }
            }
          });
        });
      });
    });
  });
  makeAppActive();
  console.log("Extension and content scripts installed");
});

manifest.js

/* content_scripts portion of our manifest.js */
"content_scripts": [
    {
      "matches": ["https://read.amazon.com/notebook*", "https://read.amazon.com/kp/notebook*"],
      "css": ["styles.css"],
      "js": [
        "libs/jquery-3.3.1.min.js",
        "parser.js",
        "insertionMarkup.js",
        "index.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": ["https://app.owlandscroll.com/*", "https://dev.owlandscroll.com/*" ],
      "js": [
        "config.js",
        "appMessages.js"
      ],
      "run_at": "document_end"
    }
  ]

webApp.html

<a target="_blank" rel="noopener noreferrer" href="https://chrome.google.com/webstore/detail/ehncpahhfadkdfneafgehhdfjfiddpje">
  Install Extension
</a>