D-76 has slightly high fog compared to Agfa 17, but this isn't important, especially at D-76 and Agfa 17's pH range, both about 9, and with the combination of metol and hydroquinone. If you are doing some measurement, addition of a bit of bromide helps it produce more repeatable result. For imaging, it's not an issue.(posted 8161 days ago)It is probably better to distinguish organic antifoggants (such asn benzotriazole) and restrainer consisnting of alkaline metal salts of halogens. They work in different mechanisms.
Halides affects granularity through its solvent effect. However, film's silver halide also releases some amount of it so it is hard to see a clear effect unless you are doing something radical. This is more obvious with print developer, to which some people add a lot of bromide to make it warm toned, but then at some point they get dichroic fog and they have to reverse some bromide.
In film developers, you might see some loss of accutance at some level of bromide because it can make adjacency effect weaker. Some people prefer to add 1/2 to 1g of KBr to D-76H for this reason, not because of fog.
I'm playing with some restrainer combined with ascorbate fine grain developer. I'll start some new thread on this topic soon. (by the way, when do we move to photo.net?)