unable to select map for upload in ubuntu+firefox

I am unable to open the selection window to upload maps. If i click the 'choose archive' button, the text disappears and flash crashes. I can click the left of the button to open the window but after i do so and select the zip file to upload and then click upload, it says i have to select a world first.
I am using ubuntu mate 17.04 with firefox 55.0.2

Please help. I have been using this site for years and don't feel like quiting any time soon.

I've got the same issue since a month now.

Chrome Version 60.0.3112.113 (64 bits) on window 7.

Edit: when refreshing the page, the 'choose archive' box appear for a split second.

More update : by disabling the CSS inline style on the page the box appear. But it's still not possible to upload the archive.

[img] [Image: view?usp=sharing]Here is a picture showing the issue
[img] .jpg   Capture.JPG (Size: 291.63 KB / Downloads: 8)

Check here link

Solved my issue.