Mozilla has added small advertisements to the new tab page of Firefox’s roughest-edged build, the channel dubbed “Nightly” because it is updated each evening.

The ads, which Mozilla’s calls “sponsored tiles,” were first discussed by Mozilla in February, but the initiative was criticized by Firefox users. The company, however, defended the in-browser ad project, saying it was important to find other revenue sources besides its long-standing deals with search providers like Google. In May, Mozilla reiterated support for the ads but also promised users that Firefox would not become “a mess of logos.”

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