Website Content Not Loading In Containers

[syberknight]

• Multi-Account Containers Version: 7.4.0
• Operating System + Version: macOS 11.5.2
• Firefox Version: 92.0

some websites but more often parts of some websites simply don't show up when loaded inside a container.
they do when loaded outside of a container in a normal tab.

i've tried disabling all plugins (except this one), and i've turned off firefox's enhanced tracking protection, and set the security preferences to normal, but still this happens consistently. i've also cleared cache & cookies - no affect.

some of the latest sites this happens for me in are:

• mailchimp.com's "all campaigns" list won't show up.
• givebutter.com's nav sidebar works but all other content missing.
• vistaprint.com works until it comes time to upload artwork.

thanks for any help, tips, suggestions, etc.

[timur-g]

Probably cache issue, same as #2351, root cause #303. This can only be closed..