rtc.js: fix firefox display of stats.
rtc.js: fix firefox display of stats.

moquist/raft.js,moquist/raft.js,tempbottle/raft.js,kanaka/fuzzy-raft,tempbottle/raft.js,moquist/raft.js,kanaka/fuzzy-raft,kanaka/fuzzy-raft,kanaka/raft.js,tempbottle/raft.js,kanaka/fuzzy-raft,tempbottle/raft.js,kanaka/fuzzy-raft,moquist/raft.js,moquist/raft.js,kanaka/raft.js,kanaka/raft.js,kanaka/raft.js,kanaka/raft.js,tempbottle/raft.js