(S (S (S (NP (BASENP (NNP Mozilla) (NNP Firefox)) (PRN (COMMA ,) (BASENP (PRPD its) (JJ main) (NN rival)) (COMMA ,))) (VP (VBZ has) (VP (VBN been) (VP (ADVP (RB actively)) (VP (VBG increasing) (BASENP (PRPD its) (NN market) (NN share))))))) (SBAR (IN while) (S (BASENP (DT the) (ADJP (RB recently) (VBN released)) (NNP Google) (NNP Chrome)) (VP (VBZ is) (VP (ADVP (RB also)) (VP (ADVP (RB quickly)) (VP (VBG gaining) (BASENP (NNS users))))))))) (PERIOD .))