I got curious about the stability of HBr and methods of making it. I found these patents that look interesting:
1,267,638 discusses NaBr + NaHSO4 --> Na2SO4 + HBr
1,193,552 NaNO3 + H2SO4 --> NaHSO4 + HNO3
NaCl + NaHSO4 --> HCl +Na2SO4
1,379,731 NaBr + H2SO4 (78%) --> hydrobromic acid
2,705,670 HBr gas from NaBr and dilute H2SO4
3,445,188 HBr produced in organic solvent using NaBr and H2SO4. One example even uses acetic acid as a solvent.
Compare the last one to US patent 3,864,115 which gives an example (example 1) for making the bromosafrole derivative from safrole and HBr in acetic acid.