I'm currently using a version of FDM, probably lite version that Hughesnet (our satellite internet provider....sucks, but I have no choice right now) has offered to it's customers, which has been modified to limit downloads to "open" download window times between 2 and 7 am (unless forced to DL now).
Anyhow, I'm going to try the more extensive version direct from FDM here. But I also been using Google Chrome (currently 22.214.171.124). In searching for this very question in forum before I pulled the trigger on FDM I just now played with something in the browser, rather than directly addressing why Chrome and FDM may not be playing well together and trying to modify the app files etc, I tried the following;
First, this version of Chrome supports the new extensions and for my work on the web I've found a need to use the extension: IE Tab - Version: 126.96.36.199, Display web pages using IE in a tab
so that was already on board before I tried experiment.
I then opened this very page with extensions function and opened as an IE page (don't ask me what IE version it uses, I have no idea).
In my Hughesnet version (which I have been using heavily, since I'm a independent internet marketing consultant and upload and download tons of large files. On a sat connection. Did I mention it sucks ?) I already have check boxes in in Settings>Monitoring set for use with IE. Their version doesn't even have a Chrome option check box.
What I've been doing has been dragging the files in question for download to the task bar icon for DL manager. I have also used the right-click and copy-shortcut way which works....sometimes, to bring up a DL task page. For me either option has been somewhat of a pain, but I need to put these file collections into very specific folders for various campaigns (PLR, MRR, FTP for websites being working on etc) so I use the download category functions to route them to their final homes when finished.
Second, in this new IE page (within Chrome browser) I right-click and at bottom of that menu is options for downloading with FDM, selection or video options.
I know this is more of a stupid-simple method but in seems like it'll work and I'll know more after playing with it more. I know it's not solving original problem but I say "adapt and overcome"
I hope that helps others too.
I'm going ahead with the FDM download because it has way more functionality and pitching Hughes' version (no love lost). I'll report back if I have any other solutions or work arounds