browser-core: update to v7.39

[remusao]

• Have you followed the guidelines in CONTRIBUTING.md?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you added an explanation of what your changes do?
• Does your submission pass tests?
• Did you lint your code prior to submission?

Because it has been a while since the last update, I have been through the list of commits to check for potential breaking changes and found none (hopefully I have not missed anything). On the other hand, here are a few improvements compared to previous version:

• much faster URL parsing with @cliqz/url-parser + new version of tldts (used to extract public suffixes), expected at least 30% speed-up
• updated adblocker with following improvements:
  • more efficient cosmetic filtering
  • removes size limit and lower memory usage while updates/initializations
  • drastic reduction in content-script bundle size by removing un-needed symbols
• refreshed content-scriptr/background communication to simplify and improve efficiency. The most noticeable effect should be a reduced latency when content-script communicates with background modules thanks to better use of callbacks in sendMessage(...) invocations.

I also tried the updated Ghostery locally and blocking (anti-tracking, adblocking, etc.) seem to work as expected.

[christophertino]

Closing in favor of #445