WIP: Implement Tor circuit hints in BundleFetcher#166
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Apr 30, 2026
| } | ||
| if (isExtensionRequest(details)) { | ||
| let headers: browser.webRequest.HttpHeaders; | ||
| if ((await browser.runtime.getBrowserInfo()).vendor === "Tor Project") { |
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This limits sending the circuit hints to TBB; on Firefox, no hint will be sent. Before merging, we may want to limit it further to specific versions of TBB, because until TBB implements its part, there's a risk of leaking information across origins.
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With this change, BundleFetchers send a custom header that the Tor Browser can use to select an appropriate circuit for the request. The header is only sent on Tor Browser.