This is what was on the ballot. https://ballotpedia.org/Houston,_Texas,_Proposition_B,_City_Firefighters_Charter_Amendment_(November_2018)
Back in the early early 2000's HPD agreed to raises in exchange for pension and benefit cuts, while firefighters rejected the raises and continued to bulk up their pension. This lead to the 25 percent pay gap between the two entities. In 2017 Houston was going bankrupt paying the firefighter pensions, so Mayor Turner went to the Texas Legislature and they approved the city's pension reform plans.
Firefighters voted down 4% pay increase in 2014. A 9.5 percent raise over three years 9.5 percent salary increase was proposed earlier in 2018.
How the hell is a city supposed to find $100 million dollars without layoffs?
Does HFD deserve more pay now that their pensions have been reduced? yes
Should it cost Houston $100 million a year when it wasn't budgeted? no
Are both the city and HFD union being assholes? yes