Save custom colors of PDF editor

[kungphoo]

** BRIEF ** 

Windows: Save custom colors set in draw and text tool when editing PDFs when closing Firefox.

** LONG **

The PDF editor is getting a lot better and I started using it as my default. It's a JS implementation, so I think it should protect us from bad PDF files properly.
However, it's still not as polished as e.g. MS Edge on Windows. Please do save the customized colors for the next Firefox session. I prefer to draw using ink blue and a not-so-aggressive yellow. Having to redefine these colors every session is tidious.

The Windows Snipping Tool, e.g. defines these default colours, which, I think, suit better for taking notes in documents (reverse order, sorry):
RGB(188,179,255)
RGB(128,214,255)
RGB(128,255,158)
RGB(255,255,128)
RGB(255,198,128)
RGB(255,128,255)
RGB( 97, 61, 48)
RGB(142, 86, 46)
RGB(187,145,103)
RGB(247,215,196)
RGB( 96, 0,128)
RGB(102, 0,204)
RGB( 61, 0,184)
RGB( 0, 77,230)
RGB( 0,170,204)
RGB( 0,128, 85)
RGB( 38,230, 0)
RGB(162,230, 27)
RGB(255,230, 0)
RGB(255,206, 0)
RGB(255,170, 0)
RGB(255, 85, 0)
RGB(230, 27, 27)
RGB(179, 21,100)

[Jon]

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