If you cannot successfully view the slideshows, it may require the use of Chrome Developer Tools.

To open Chrome Developer Tools, you can use any of the following methods while you are on the webpage where the Google Slides are failing to load:
1. The Keyboard Shortcuts (Fastest)
  • Windows / Linux: F12 or Ctrl + Shift + I
  • macOS: Cmd + Option + I
2. The Right-Click Method
  • Right-click anywhere on the page and select Inspect at the bottom of the menu.
3. The Chrome Menu
  • Click the three vertical dots (⋮) in the top-right corner of Chrome.
  • Go to More Tools > Developer Tools.
What to look for once it's open:
Our Google Slides are "viewable by all," but if they are still failing to load, the issue is likely a network block or a cookie conflict within the school's high-security firewall. Here is how to use the tools to find the culprit:
Step 1: The "Console" Tab Look for red text. If you see an error like Refused to display '...' in a frame because it set 'X-Frame-Options' to 'sameorigin', it means Chrome is blocking the slide because of a security conflict.
Step 2: The "Network" Tab
  1. Click the Network tab at the top of the DevTools panel.
  2. Refresh the page (F5).
  3. Look for any rows highlighted in red.
  4. If you see Status: Blocked or Status: 403, click on that row. Under the "Name" column, if it mentions docs.google.com or drive.google.com, the school's IT department has likely blocked Google Drive embeds at the firewall level.
Common "Hidden" Culprits:
  • Third-Party Cookies: Many schools block "third-party cookies." Since our slides are embedded on app.grammarflip.com, Chrome treats the Google Slide as "third-party" data. If cookies are blocked, Google can't verify the "viewable by all" permission.
  • The "Managed" Account Bug: If a student is logged into a personal Gmail AND a school Gmail at the same time, Google often "confuses" the two and denies access. Opening GrammarFlip in an Incognito Window usually fixes this immediately.
To help identify the root cause, please check the following in the Chrome Developer Tools (F12 > Console tab) while attempting to load a lesson:
  1. Check for "403 Forbidden" or "Blocked" Errors: If you see red lines indicating that docs.google.com or googleusercontent.com are blocked, the district firewall may be preventing cross-domain embedding.
  2. X-Frame-Options/CORS Policy: Look for errors stating: "Refused to display... in a frame because it set 'X-Frame-Options' to 'sameorigin'."
  3. Cookie Restrictions: If the console shows errors regarding Third-Party Cookies, the district may need to add [*.]grammarflip.com as an exception to allow the Google Drive authentication to pass through to the embed.
Please ensure that the following domains are whitelisted for both script execution and iframe embedding:
  • *.grammarflip.com
  • docs.google.com
  • drive.google.com
  • *.googleusercontent.com