Yesterday I learnt via
Opera Tips that it's super easy to enable something like Click to Flash in
Opera 10.50 Alpha: Just open this link in your Opera
opera:config#UserPrefs, set the checkmark for Enable On Demand Plugin and save the changes at the bottom of the settings block.
On every page you load afterwards (no re-start required) embedded plugins are replaced by a Play icon, only after clicking on that icon the plugin content is loaded. I enabled this today in my install and gave it a try and so far I like it very much. It also came to my mind that it would be fun to let this look like what Mobile Safari on the iPhone/iPod touch/iPad does, replace plugin content with a blue Lego cube:
Turns out one can even do this since the missing plugin icon is a SVG image inside the Opera.app package. I quickly drew an Opera-style cube and replaced the original icon, again Opera used it without a re-start. If you want to use or modify it I have prepared a ZIP archive that contains my SVG images. It also includes a matching missing plugins hover icon but it seems that one is not yet used by Opera:
missingpluginsvgs.zipIn order to use them, open your Opera 10.50 Opera.app package in the Finder and go to Resources/extra, backup the original two files, then replace them with my two graphics from the ZIP archive. This has to be repeated after each Opera upgrade.