Wasn't pepper the P in PNaCl?
The P in PNaCl is Portable.
Pepper was a pun on Native Client (since NaCl = salt). Pepper Plugin API (PPAPI) was Google's more secure version of NPAPI (Netscape Plugin API). Flash Player was essentially the only thing using NPAPI/PPAPI by the end of its life.
The most common plugins were Flash, Silverlight, Adobe Reader, and the Java applet plugin, and I think all of those were in mildly common use when plugins were on their last legs.
Crossbridge was its third and most recent name.
Pepper.js is another interesting project from around this time that didn't pan out.
https://github.com/google/pepper.js/