--- a/devtools/shim/aboutdevtools/aboutdevtools.xhtml
+++ b/devtools/shim/aboutdevtools/aboutdevtools.xhtml
@@ -24,25 +24,25 @@
       <div class="left-pane" />
       <div class="right-pane">
         <h1 class="title" id="common-title" hidden="true">&aboutDevtools.enable.title;</h1>
         <h1 class="title" id="inspect-title" hidden="true">&aboutDevtools.enable.inspectElementTitle;</h1>
 
         <!-- Include all the possible message, hidden by default
              as we can't lazily load localized strings from dtd -->
         <p id="about-debugging-message" hidden="true">&aboutDevtools.enable.aboutDebuggingMessage;</p>
-        <p id="menu-message" hidden="true">&aboutDevtools.enable.menuMessage;</p>
+        <p id="menu-message" hidden="true">&aboutDevtools.enable.menuMessage2;</p>
         <p id="key-shortcut-message" hidden="true">&aboutDevtools.enable.keyShortcutMessage;</p>
         <p id="inspect-element-message" hidden="true">&aboutDevtools.enable.inspectElementMessage;</p>
 
         <p>&aboutDevtools.enable.commonMessage;</p>
         <a class="external installpage-link" href="https://developer.mozilla.org/docs/Tools" target="_blank">&aboutDevtools.enable.learnMoreLink;</a>
         <div class="buttons-container">
           <button class="primary-button" id="install">&aboutDevtools.enable.enableButton;</button>
-          <button class="default-button" id="close">&aboutDevtools.enable.closeButton;</button>
+          <button class="default-button" id="close">&aboutDevtools.enable.closeButton2;</button>
         </div>
       </div>
     </div>
   </div>
 
   <!-- This page, hidden by default is displayed once the add-on is installed -->
   <div id="welcome-page" class="wrapper" hidden="true">
     <div class="box">

--- a/devtools/shim/locales/en-US/aboutdevtools.dtd
+++ b/devtools/shim/locales/en-US/aboutdevtools.dtd
@@ -31,35 +31,35 @@
 <!-- LOCALIZATION NOTE (aboutDevtools.enable.aboutDebuggingMessage): Message displayed
   -  when users come from about:debugging. -->
 <!ENTITY  aboutDevtools.enable.aboutDebuggingMessage
           "Develop and debug WebExtensions, web workers, service workers and more with Firefox Developer Tools.">
 
 <!-- LOCALIZATION NOTE (aboutDevtools.enable.keyShortcutMessage): Message displayed when
   -  users pressed a DevTools key shortcut. -->
 <!ENTITY  aboutDevtools.enable.keyShortcutMessage
-          "You activated a Developer Tools shortcut. If that was a mistake, you can close this tab.">
+          "You activated a Developer Tools shortcut. If that was a mistake, you can close this Tab.">
 
-<!-- LOCALIZATION NOTE (aboutDevtools.enable.menuMessage): Message displayed when users
+<!-- LOCALIZATION NOTE (aboutDevtools.enable.menuMessage2): Message displayed when users
   -  clicked on a "Enable Developer Tools" menu item. -->
-<!ENTITY  aboutDevtools.enable.menuMessage
-          "Examine, edit and debug HTML, CSS, and JavaScript with tools like Inspector and Debugger.">
+<!ENTITY  aboutDevtools.enable.menuMessage2
+          "Perfect your website’s HTML, CSS, and JavaScript with tools like Inspector and Debugger.">
 
 <!-- LOCALIZATION NOTE (aboutDevtools.enable.commonMessage): Generic message displayed for
   -  all possible entry points (keyshortcut, menu item etc…). -->
 <!ENTITY  aboutDevtools.enable.commonMessage
           "Firefox Developer Tools are disabled by default to give you more control over your browser.">
 
 <!-- LOCALIZATION NOTE (aboutDevtools.enable.learnMoreLink): Text for the link to
   -  https://developer.mozilla.org/docs/Tools displayed in the top section when DevTools
   -  are disabled. -->
 <!ENTITY  aboutDevtools.enable.learnMoreLink "Learn more about Developer Tools">
 
 <!ENTITY  aboutDevtools.enable.enableButton "Enable Developer Tools">
-<!ENTITY  aboutDevtools.enable.closeButton "Close this page">
+<!ENTITY  aboutDevtools.enable.closeButton2 "Close this Tab">
 
 <!ENTITY  aboutDevtools.welcome.title "Welcome to Firefox Developer Tools!">
 
 <!ENTITY  aboutDevtools.newsletter.title "Mozilla Developer Newsletter">
 <!-- LOCALIZATION NOTE (aboutDevtools.newsletter.message): Subscribe form message.
   -  The newsletter is only available in english at the moment.
   -  See Bug 1415273 for support of additional languages.-->
 <!ENTITY  aboutDevtools.newsletter.message "Get developer news, tricks and resources sent straight to your inbox.">