Yes, this firm was doing standard opposition research but hadn't found anything and that's why they were let go. Hillary's people and the DNC specifically had them target the investigation towards Russia even hiring a former British spy. More than six million dollars later a dossier was created with some false information in an effort to get the FBI to investigate Trump including NSA wiretaps. Keep in mind, all the Clinton campaign needed was for it to appear Trump was in trouble.
So mainly two things here: 1) It's a lie that they were doing what a Republican candidate was already doing instead they had a specific plan to create a falsified report that would be sent to the FBI. 2) The dossier was made up. If there was anything legit about it, the FBI and all the committees investigating Trump's campaign would've already nailed him. This is common sense.
One more very important thing for you to think about; this all started when there were three Democrat candidates yet the DNC and the Hillary campaign worked together on the dossier. The DNC had chosen their candidate but apparently didn't let Bernie Sanders or Jim Webb know.
The DNC is so corrupt. The last three people in charge (Debbie Wasserman Schultz, Donna Brazile, Tom Perez), have all been caught in various scandals. Integrity certainly doesn’t matter at the DNC. Anyhow, I hope you see just how disgustingly misleading Democrats and the mainstream media are. Like I've said before, truth is like kryptonite to the Left.