Hello,
an icons problem has been reported with rodent-icon-theme in Fedora 22 XFCE-based; it seems that its icons are huge making Firefox browser unworkable.
Bug https://bugzilla.redhat.com/show_bug.cgi?id=1225711
Screenshot: https://bugzilla.redhat.com/attachment.cgi?id=1031381
Hmm... Is this only with Firefox or other apps too? Icons are svg images so they are scalable and size should be set by the application using them...
It happens only in Firefox-38.0.1 for me.
I use IceCat (based on Firefox 31.6 ESR) and it has not problems with Rodent icons.
It seems that also XFCE-desktop icons menu are huge...
Last edit: Antonio Trande 2015-05-29
I noted that this problem is reproducible in a fresh Fedora 22 XFCE-based by setting Rodent as icons system.
Please, check if Rodent icons are installed properly and their characteristics are good.