In Fahrenheit 451, what was man's major pursuit during Montag's time?

In Montag's time, man's pursuit was to find momentary happiness
without depth. This is demonstrated through the types of classes offered at Clarisse's school,
the fact that the society burned books which would challenge a person to think, and the false
interaction Mildred had with the "family" of characters that invaded their living room on a
daily basis.

If by chance, you are referring to the era in which Ray
Bradbury wrote the novel, then the 50s were influenced by man's pursuit to tell on other men who
were in the wrong. Book burnings, censorship, and ill-treatment of any Communist friendlies all
became commonplace.