Check a File System

To check a file system you can use the fsck command.
For detailed information checking GNU/Linux ext2/ext3/ext4 file system, you should use e2fsck.

Check badblocks on a device

If error occurs, strange behaviour or if SMART error are reported (Cf. instructions to get report), you should check file System (see next post), including bad blocks.

Migrate you URL nicknames from Opera to Firefox

Follow those instructions:
 - under Opera, export your bookmarks (e.g. to /tmp/bookmarks.adr file)
 - into a console, parse the file like that :
cat /tmp/bookmarks.adr |tr -d '\n' |sed -e 's/#/\n/g;' |grep "SHORT NAME" |sed -e 's/.*URL=\([^ \t]*\)[ \t].*SHORT[ ]NAME=\([^ \t]*\)[ \t].*$/\2\t\1/g;' > /tmp/urlAlias.txt
 - under Firefox, go to Preferences of Url Alias add-on
 - copy/paste contents of /tmp/urlAlias.txt in "Configuration" panel

Firefox add-ons providing more or less same Opera functionalities

Those are Firefox add-ons which fit more or less some Opera functionalities I found the most useful:

Goodbye Opera, Welcome back my Beloved Firefox Web Browser

I'd used Opera from May of 2008 to March of 2010, against my strong philosophy of open-source software use.