How to add extension

[prog79315-eng]

asking how to add extension thank you

[feder-cr]

There is no extension argument in the wrapper, but profile_dir= gives you a persistent Firefox profile, and an extension installed into that profile stays across runs:

InvisiblePlaywright(seed=42, profile_dir="/path/to/profile")

Launch once with that path, install the .xpi the normal way from about:addons, then reuse the same directory. Without profile_dir every session builds a fresh profile from the seed, which is why an extension installed in one run is gone in the next.

Worth knowing before you add one. A Firefox extension is visible to pages through its web-accessible resources, so it is a fingerprint surface of its own, and an extension that rewrites navigator or canvas will be arguing with an engine that has already answered those questions.

If you want to see what an extension changes about the fingerprint before you commit to one, the surfaces are written up one at a time at https://feder-cr.github.io/invisible_playwright/.