To resolve this problem, the user must allow list force.com and salesforce.com. An allow list is essentially a list of safe or approved websites.
Since there are several ad-blocking tools available and for different web browsers, we recommend that you search online for allow listing instructions for your particular tool. As an example, if you’re using AdBlock Plus, you would follow these instructions:
Add A Domain in AdBlock Plus Allow List (for Google Chrome users only)
1. Right-click AdBlock Plus icon at the upper-right hand corner of the web browser. Select Options in the menu.
If the plugin icon is hidden, open a new tab instead, then enter chrome://extensions in the address bar. You will be redirected to the add-ons page afterward. Find AdBlock Plus in the list, and click Options.
2. Go to the Whitelisted domains tab. See screenshot in the next step for reference.
3. In the text entry box, type in the website link you want to add to the list, for example, www.google.com
Note: Don't include http:// or https:// in the URL.
4. Click on the Add Domain button, and the link will be included to the allow list automatically.
Visit the website you've just added, and verify if ads and other page elements are showing properly.