@drdan Never mind. I found it. Duh. It's located on the left bar where I have to click on the heart and it will take me to bookmarks. It then takes me to where I want to be: "Other Speed Dials".
opera:config belongs to versions before Opera 14 - in the case of Android that would be what is called Opera Classic. Completely different thing.
It can't be done automatically, but if you want to you can essentially take a snapshot of the current page using "Add to ... Offline pages". Since it is actually saved to your device it won't update.
Ah, okay. I edited your title to be clearer. One feature I do like about Firefox for Android (links from other apps don't cause it to steal focus). Sorry, no idea if they've given it serious consideration, but it has been suggested before - quite some time ago.
Let me check ... though I suppose you can delete the cache through Android's settings. But no, it should probably be covered under the "browsing history" option. Keeping the cache would invalidate clearing the recent history since anyone with the right access could just examine the cache to determine where you'd visited.
Since the OP has cancelled his/her account, I'm closing this topic.
Those who want can start a new one in the proper area to discuss about the suggestion.