I'm not an attorney in Delaware, but for a bit of clarification, here's how a protective order can be obtained (this part is not affected by the proposed law):
One party (the Petitioner) goes to court and files and applies for an emergency protective order alleging that his/her partner (the Respondent) has engaged in domestic violence. Pursuant to 10 Del C. §1043, the court conducts an ex parte hearing (meaning the Respondent isn't in court and doesn't get to tell his/her side; the court only gets one side of the story). If the court determines that the preponderance of the evidence supports the allegation (i.e. if its more likely than not that it happened), the court issues the emergency order. Then the Respondent is entitled to a hearing within 30 days. At that time, s/he has an opportunity to tell his/her side of the story to the court, and the judge makes the decision to vacate the order or continue it.
Under this new proposed statute, the Respondent's firearm(s) would have to be confiscated pending that final hearing (and if the order is maintained after that).
So, let's say you've got a nasty break-up going on. Your partner knows you love your firearms, so s/he goes to court and says you assaulted him/her and s/he needs protection -- oh, and you have firearms. Without you being there, the court could grant the emergent order, removing you from the house and also ordering the seizure of your arms pending the full hearing.
If it's any consolation (which it isn't), the new law doesn't apply if the basis for the protective order is: "engaging in a course of alarming or distressing conduct in a manner which is likely to cause fear or emotional distress or to provoke a violent or disorderly response;" or "Trespassing on or in property of another person, or on or in property from which the trespasser has been excluded by court order." The allegation has to be something more serious.
If you don't think this is a potential problem, let me say that this is very similar to the way things work in New Jersey (where I am an attorney). I can tell you, even if the order is later dismissed, it's a serious pain in the butt getting those firearms returned. Of course, Jersey is still worse. There, if an officer responds to a domestic violence call and the officer sees any signs of domestic violence (which could just be redness), the officer must arrest the suspect. In addition, the officer must then inquire if there are weapons on the premises and "seize any weapon that the officer reasonably believes would expose the victim to a risk of serious bodily injury." N.J.S.A. §2C:25-21. So the officer gets to make the determination right there at the scene whether your firearms are going to be taken.