This incident has been resolved - Zapier is loading consistently on Safari and Firefox.

We have released a fix for this issue - Zapier pages should now load as expected on both Firefox and Safari.

We have identified an issue where Zapier pages do not load properly on Firefox and Safari. Chrome loads properly, so we recommend using Chrome for now if you need to access your Zaps urgently! Our engineering team is working on a fix for this and it should be released shortly.