netzero has 3 basic plans
1. free w/ ads
2. cheap no ads standard speeds
3. acellerated dialup no ads their most expensive option (high speed)
I have the free dialup and get good connection speeds, you do have to use their software to connect for the free stuff which is time limited per month but usually covers me when I can't get a hotspot. You can configure the software in conjunction with your computer to allow for connection noises if you so desire, however many modem mfg's have stopped putting speakers on modems
Firefox works fine with all versions of their software.