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"Generate firewall ACL rules based on packet addresses and ports."
main_ui_->actionToolsFirewallAclRules->setEnabled(frame_selected);

That menu item is only available when a single packet/frame is selected.
Load a capture file (or capture (capture some packets) then select one in the Packet List to make it active.
If multiple frames are selected (using CTRL or Shift while clicking) or if no frames are selected (CTRL click), it will be greyed out.

"Generate firewall ACL rules based on packet addresses and ports."
main_ui_->actionToolsFirewallAclRules->setEnabled(frame_selected);

That menu item is only available when a single packet/frame is selected.
Load a capture file (capture some packets) then select one in the Packet List to make it active.
If multiple frames are selected (using CTRL or Shift while clicking) or if no frames are selected (CTRL click), it will be greyed out.