AVG & Firefox incompatability?

Hi,

Having a really odd one where I think my AVG antivirus is really interfering with firefox. On certain sites like Reddit, the page just never loads and hangs. On Chrome however, I don't notice these problems.

Have used them both together before without issue but think I did inadvertently install AVGs browser when doing a reinstall on my new machine recently. Wondering if AVG would've set some sort of setting on Firefox or something?

Thanks,