有点旧（针对opera 6）但还是可以看看。

Don’t lose your menu bar

Since “I lost my menu bar, how do I get it back?” is a FAQ in the Opera for Linux forum, here two answers: Either close all windows and right click on the empty workspace and select Show menu bar or simply press Ctrl+F11.

Opera hangs if site uses Flash

If Opera freezes when you access a Flash page, try starting Opera like this:

For Gnome, try this from command line (terminal): esddsp opera

Or, for KDE: artsdsp opera

Change the threshold of the “Open page” warning

Opera can warn you, before it opens a lot of bookmarks at once. It will then display a message box and ask you something like “You are about to open 903 pages. Proceed?”. The default threshold for this warning is four. So if you open more than four pages, Opera will ask you before it proceeds. You can change this threshold or disable it by editing ~/.opera/opera6.ini. Make sure to close Opera before editing the file. Then use

[HotListWindow]

OpenWarningLevel=n

Set n to either the new threshold, e. g., 10, or to -1 to disable it. Note: The [HotListWindow] entry will probably already exist. So look for it first.

Listen to MP3 streams

Use the following settings if you want to be able to listen to MP3 (.pls) streams on the Internet:

MIME type: audio/x-scpls

File extensions: pls

(*) Open with other application

[/usr/X11R6/bin/xmms]

Restoring the default settings in Opera for Linux

To restore your default settings, delete the file(s) “opera*.ini” in your “~/.opera” directory. This can sometimes solve problems you are suddenly experiencing. [...]

更多：

http://www.schrode.net/opera/tips/tips.html

http://www.schrode.net/opera/support/knowledge-base.html