Update README.MD to add Firefox version availability

Author: MaxRohowsky

README.MD

@@ -8,6 +8,7 @@
 #### Outline HTML elements with a colorful border without affecting the layout to inspect the structure of websites.
 
 👉 Get it for Chrome: 🔗 [Chrome Webstore](https://chrome.google.com/webstore/detail/ihlgleabnhekkankfpfoafkobncbfcfo)
+👉 Get it for Firefox: Firefox version available but unstable.  
 
 Made by [maxontech](https://twitter.com/max_on_tech)
 

main/assets/icon-128.png renamed to chrome/assets/icon-128.png

@@ -75,7 +75,8 @@ chrome.runtime.onInstalled.addListener((object) => {
         for (let j = 0; j < t; j++) {
           currentTab = currentWindow.tabs[j];
           //console.log(currentTab);
-          if (!currentTab.url.includes("chrome://") && !currentTab.url.includes("chrome-extension://") && !currentTab.url.includes("chrome.google.com")) {
+          if (!currentTab.url.includes("chrome://") && !currentTab.url.includes("chrome-extension://") && !currentTab.url.includes("chrome.google.com") && !currentTab.url.includes("chromewebstore.google")) {
+
             injectIntoTab(currentTab);
           }
         }

main/assets/icon-16.png renamed to chrome/assets/icon-16.png

@@ -88,7 +88,7 @@ <h2 id="webframe-elements-text">Elements</h2>
       <div id="elementsContainer"></div>
       <br />
       <div style="text-align: center;">
-        <a href="https://github.com/maxontech/outline-html-elements">GitHub</a>
+        <a href="https://github.com/maxontech/outline-html-elements" target="_blank">GitHub</a>
       </div>
 
     </div>