Our gemara, at Berachos 13a, is discussing the possibility that the future redemption of the Jews will dwarf the long-ago exodus from Egypt. It remarks that if someone were endangered by (and then saved from) first a wolf, then a lion, then a snake, each attack would make previous attacks seem not worth the mention. In other words, during the time between the first attack and the second, the first attack would be an interesting story; but once a later and more remarkable danger had been braved, the earlier and relatively minor danger would not be worth mentioning.
Tosafos at Avodah Zarah 2b is not interested in the actual subject matter of this gemara at Berachos 13a, the redemptions of the Jewish people. He is just pointing out the opinion, which the gemara takes for granted, that the three types of animals are listed from least dangerous to most dangerous. And it appears that Tosafos' version of this gemara in Berachos lists the third animal as bear, not snake, as remarked-upon in the Mesoras Ha Shas at Berachos 13a.
Tosfaos at Avodah Zarah 2b proceeds as follows. Unfortunately I'm not particularly curious about, or capable of, correct voweling of the Hebrew. But here's how I would say it.
Veyeish loimar One could say
de af al gav de ari melech that although the lion is a king
mikol makoim nonetheless
doiv hu az yoiseir the bear is stronger
uba'al tachvulois and shrewd
kedeamar beperek kama as is said in the first chapter
deberachois (daf 13) of Tractate Berachos (page 13)
gabei tzarois ha-acharoinois concerning later troubles
mishkachois harishoinois which cause one to forget the earlier ones,
haniach ma'aseh ari so that one would omit the episode of the lion
usapeir ma'aseh doiv and tell of the episode of the bear.