Reuse browser profile on Travis

[luixxiul]

Describe the issue you encountered:

Reuse browser profile on Travis to track the issues with daily usage, one where you could not delete quite old entries on about:history, for example.

Currently Travis tests cannot track them because the profile folder is cleared on every run, which is not realistic. Adding tests with the existing profile would help us to detect that kind of issues, for which it is often hard to specify the STR.

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