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You're very welcome!

And too funny - I'm also a diehard Firefox user! To be fair, Chrome is my backup browser, but I mainly use it for secondary social media accounts, so I don't have to login/logout all the time... lol!

However, I've never been able to post to IG with just a browser (without using Hootsuite), because it's an app - at least, that's my understanding of it. Good luck finding the solution!