The sandbox frame is too short on some feeds, making it so that I cannot see much of the text without opening the item's link.

Example below, from this feed:

As you can see, there is a scrollbar, but it won't go down far enough. The smart-rss-content-footer cannot be scrolled into view.

This has been happening in all versions of this extension. Curiously, this bug does not happen on the old extension (that this one is forked from)

My hypothesis is that the height calculation isn't working properly. However, I am not sure how to fix it.

I am using Opera 73.0.3856.284.
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 OPR/73.0.3856.284.
Also reproducible in MS Edge.

Another feed that exhibits the same problem: this one with item guid https://emojiwrap.com/issues/43 (yet other items from the same feed seem to work fine).