Turn off Firefox’s built-in Tracking Protection feature. Luckily, it can be turned off for individual sites.
Here’s how to do it:
Select the shield icon or the information icon to expand the Control Center panel.
Click the Turn off Blocking for This Site button from a normal browsing window to disable blocking for the website.
Once content blocking is disabled, a shield icon with a strikethrough will appear in your address bar. To turn content blocking back on, expand the Control Center panel by clicking the shield or the site information button and click the Turn on Blocking for This Site button.