GitHub – How to Set Git Branch Protected by Default When Created

You can see the commits and changes between tags if you change the URL to the following format:

https://github.com/{username}/{repo}/compare/{older-tag}...{newer-tag}

This will show you the count and changes of up to 250 commits made between the tags.

So from your example it would be:

https://github.com/ankidroid/Anki-Android/compare/v2.2beta7...v2.2beta8

Similarly if you wanted to compare commits between branches the URL would be like this:

https://github.com/{username}/{repo}/compare/{branch}...{other-branch}

Hopefully you've found a good workaround by now, but if not, you can use a bookmarklet to exclude a milestone (or change any other search parameter). Unfortunately GitHub doesn't allow you to change the default search query.

Add this bit of code as a bookmark in your browser, and when you go to the Issues page for any repository, just click the bookmark and it will exclude whichever milestone(s) you want.

javascript:
(function(){
    document.getElementById('js-issues-search').value = 'is:issue is:open -milestone:foo';
})();

Just change foo to whichever milestone you wish to exclude.