This seems like a weird time to be making noise about this. Mozilla has been trying to become less Google-dependent for a long time. In this past half decade especially they've made huge strides with less and less of their total revenue coming from Google royalties:

  2023: 75.8% of revenues from Google royalties
  2022: 86.0%
  2021: 87.8
  2020: 88.8
  2019: [^a]
  2018: 95.3
  2017: 95.9

This data is based on their independent auditors reports.

[^a]: this was a weird year where their "other" income got a massive one-time boost. I'm not sure what happened. Did they get a $338m grant? If you take that number out (which is normally at or near zero) the percentage is around 91%