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There was an issue with Exclusions earlier when the web shield started scanning https traffic, but it places an http: tag in front of the https url entered, just as it has for a very long time. Used the above url changed to https as an example.
it does not work, you can not access the site (I have to completely disable Avast, which is unfortunate)
My comment was more of an expansion to Lukor as there are other issues in the exclusions.
Don't completely disable avast, you would be completely unprotected. The web shield is what is looking after the web browsing side and no doubt alerting, so disabling that still leaves you the fall back of the file system shield.
I have visited the home page of the link you gave and no alert by avast, I'm using firefox 32.0.3, with noscript and requestpolicy. These would ordinarily protect against scripts on the site and third party scripts (on other sites).
I have selectively allowed permissions and I still don't get an alert - can you attach a screenshot of the avast alert window.