Warhammer 4th edition character sheet - Problem with skills on Firefox

Hi. I've created new WFRP 4 game and tried to use Skills from charaqccter sheet. When I click on roll button for any skill, usually there is no effect. Other rolls like weapons, armor, etc. work correctly. Once for many attempts I make, skill rolls work, but it's very rare situation and I don't know what the rule about it is. Problem appears on Firefox 67.0.3 with uBlock, Cisco Webex extension and Avast Online security addon instaled. My OS is Windows 8.1 Pro. I don't experience this issue while using Chrome browser.

Hello Pawel K., I am sorry to hear that you have encountered this issue with unresponsive buttons for skills. Please turn off all extensions/add-ons and clear your cache in Firefox then see if the issue persists. If the issue still persists,  please thoroughly work through all of  Step 4  in our  Solving Technical Issues  guide .   (Don't forget the complete Console Log!) Thanks!