"Play in browser" telling me to update and download?

[Gutrippa]

For some reason, whenever I try to play UB2 in the browser (Mozilla) it tells me to download the latest update (with toggle fullscreen, tanks and airplanes, new WW2 accessories, Bugs fixing)?

I don't know why I've got this error- if I use the Windows Client it works fine, but I'd prefer to play through the browser regardless!

[Lorenzo]

Have you tried to clear your browser cache?
On Chrome you achieve that by clicking Shift on your keyboard and the refresh button in the browser.

[Gutrippa]

Yeah, hasn't worked, oddly enough! Got no idea why this is happening. When I try on IE it doesn't give me any update trouble (but, y'know, IE as has other troubles all of its own!).

[Lorenzo]

Have you tried Incognito Mode?

[Gutrippa]

... that DID work! Do you have any idea why? D:

[Lorenzo]

It’s a cache issue, I think your browser is trying to use the old cached version. When you use Incognito Mode it never uses the cached data saved on your computer.