Is it possible to use logos, such as firefox, in the demo version of the design, for example, as a header element?

Question

Design

I saw similar topics on the forest, of course, this is only for demonstration, when buying such a template - these photos are missing. But still - how are things going with the rights, whose logo can be used and whose logo cannot?

Answer 1

Of course, it is better not to use real trademarks.
You can always find images that are free (or attributable) to use for commercial purposes.
For example, when searching for pictures in google, in the "search tools" there is a choice of license.