I want to alpha mine Grin

Here my computer's specs:
Windows 10 x64/Ubuntu 16.04.3 LTS (I use 2 operating system in 1 computer)
Intel Core i7-2670QM
AMD Radeon HD 7400M
8 GB DDR3 SDRAM

Browser:
Firefox Quantum 57.0.4 (Win 10 64bit) /  Firefox-58.0b15 (Ubuntu)
Google Chrome Version 63.0.3239.132 (Offizieller Build) (Win 10 64-Bit) / Google Chrome Version 63.0.3239.84 (Ubuntu)