ProtonVPN Firefox Extension drops query string for HTTP schema

[alexeygon]

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There is a bug on ProtonVPN extension for Firefox.
How to reproduce:
Open Firefox.
Turn off ProtonVPN connection.
Navigate to link http://echo.free.beeceptor.com/?something=1. Not https, http exact!
There is 'something' param in 'parsedQueryParams' hash. It's OK.
Turn on ProtonVPN connection.
Navigate to link http://echo.free.beeceptor.com/?something=1.
Actual result: parsedQueryParams is empty.
Expected result: 'something' param in 'parsedQueryParams' hash.

If you navigate to https schema, there is no problem at this case.