since when did firefox processes on linux start showing up as 'We' in top?

Name Firefox; Version 59.0.2 Build ID 20180326161258; User Agent Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0; OS Linux 4.13.0-37-generic firefox processes are showing up differently now, or is there a security issue? I have never seen procs that look like this before: dsprouse 15514 15220 1 12:17 ? 00:00:01 /usr/lib/firefox/firefox -contentproc -childID 5 -isForBrowser -intPrefs 6:50|7:-1|19:0|34:1000|42:20|43:5|44:10|51:0|57:128|58:10000|63:0|65:400|66:1|67:0|68:0|69:100|74:0|75:120|76:120|159:2|160:1|164:60|165:30|166:512000|175:5000|177:6|191:8192|192:524288|193:5|206:10000|227:24|228:32768|230:0|231:0|240:5|244:1048576|246:100|247:5000|249:600|250:4|251:1|260:2000|277:3|290:60000|308:300|309:30| -boolPrefs 1:0|2:0|4:1|5:0|24:1|27:0|28:1|29:1|31:1|32:1|33:1|36:1|37:0|38:1|41:1|45:1|46:0|47:0|48:1|49:1|50:1|52:0|55:1|56:1|59:0|60:0|61:0|62:0|64:0|70:1|71:1|72:0|73:1|77:1|78:1|79:0|80:0|81:1|82:1|83:0|84:1|87:0|88:0|91:1|92:1|96:1|97:1|98:0|99:1|100:0|101:0|103:0|104:0|105:1|106:1|107:1|110:1|111:1|112:1|113:1|114:1|115:0|116:0|117:0|119:0|120:1|121:1|122:0|123:0|124:0|125:0|127:1|128:0|129:1|130:1|131:1|132:0|133:0|134:1|135:1|136:1|137:1|138:0|139:1|140:1|141:1|142:1|143:1|144:1|145:0|146:1|147:1|148:0|149:1|150:0|152:0|153:0|154:0|155:1|156:1|157:1|158:1|161:1|162:0|172:0|173:0|174:1|178:1|180:1|181:0|182:1|184:1|186:0|187:0|190:0|194:1|195:0|196:1|197:1|198:0|201:1|205:1|207:1|208:0|210:1|213:0|225:0|226:0|229:1|232:0|234:1|235:1|237:1|238:0|245:1|248:1|253:0|254:0|255:0|256:1|257:1|258:0|259:1|264:0|267:1|268:1|269:1|270:1|271:1|272:0|273:0|279:1|282:0|283:0|284:1|285:1|286:0|287:1|288:1|289:1|291:0|292:0|294:0|303:1|304:1|305:0|306:0|307:0| -stringPrefs 3:7;release|151:0;|212:3;1.0|223:332;  ¼½¾ǃː??։֊׃״؉؊٪۔܁܂܃܄ᅟᅠ᜵           ???‐’․‧??????? ‹›⁁⁄⁒ ⅓⅔⅕⅖⅗⅘⅙⅚?⅜⅝⅞⅟∕∶⎮╱⧶⧸⫻⫽⿰⿱⿲⿳⿴⿵⿶⿷⿸⿹⿺⿻　。〔〕〳゠ㅤ㈝㈞㎮㎯㏆㏟꞉︔︕︿﹝﹞?．／｡ﾠ???�|224:4;high| -schedulerPrefs 0001,2 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 15220 true tab