Aside Disappear Suddenly - Never Seen This Issue

I'm currently creating a website, which has an div called Aside. This is basically an aside part of the website. I'm including it to my index.php. There is nothing serious about it

Solution 1:

Disable AdBlock / AdBlock Plus in your copy of Firefox, or give the div another ID / class as a quick fix. The reason I thought of this first was because I had a much more blatant ID of "advert" on a div which I only noticed got blocked in a copy of Firefox which had AdBlock Plus installed when I was testing the site out.

A more permanent fix, if you intend to keep using AdBlock, would be to remove the name of the div that got blocked from the list of keywords / filtering rules that you're using.