Why some say "rpm hell"

[AP]

On Tue, Nov 26, 2013 at 8:13 PM, Tim <ignored_mailbox at yahoo.com.au> wrote:

> Are you running some extra privacy options in your browser or gmail?
> Are you actually using the "reply" function, or are you mistakenly
> forwarding?

I am using extra privacy options in the Firefox but not in Opera.
Sometimes I use Opera also and other times Firefox. In Firefox, I am
using the addons like NoScript, AdBlock Plus and Better Privacy. Yes,
on the bottom of each mail I click "reply" to reply to an email but
not the option of "forwarding".

Thanks.