...What that means , out of topic and i used EXTENSIVELY opera since a lot of years.
Still opening 12 til last week and i need the bookmarks still (with info /categories and so on) ,
but now is becoming too slow .

In topic , the info /news about that B-manager is quite nice , strange they did not spread better ,
it took the "good eye" users to find out and shar so we could experiment (not enabled by default)^^

thanks Cristoph for pointing the opera bookmark .
not custom notes , not subfolders on tree and not a FIXED sidepanel ,
but i stand corrected about the "page you are on".the direction is so close , that i hope they'll bring back the fixed sidepanel , crossing fingers

wangmuler , to do it select the folder of the "launcher.exe" ( do NOT open it or explore it , just select it )
then start a prompt FROM the launcher directory ( right click "COMMAND promt here " and type:

launcher.exe --presto-small-prefs-dir="YOUR-12.16._opera-BOOKMARK-PASS-Wand.dat-Directory"

( off course i mean that :YOUR-12.16._opera-BOOKMARK-PASS-Wand.dat-Directory is your old profile directory where those files are present , like wand.dat, bookmarks.adr and so on)

Actually i heard that standalone programs that do something about exist .
I did not try still ,
one is called Linkman by outertech .
Free and pro version .
_____________-

Then :tried beta of developer version (25) they included a bookmark manager ,
you activate it on opera://flags (type in browser) .
Then , on speed dial page , top middle is bookmark manager button .
it opens a large page with your bookmarks , you have to change to list view to see them better.

Still not "the ball" i hope for (separate panel view ,and custom names/notes would be) ,
but is something ,(you can access also from opera->bookmarks once activated firefox style)

ok i did take a look .Super big Icon like an infinite speed dial , but you can select "list view" and it's a bit better , though obviously need still a lot to do .
Not the ball right now but i hope is promising ,

-it takes all the screen ( that'the worst issue for workflow as for now )
and have to open a new page .you cant open in a separated panel seeing still the page you are on.

• no subfolders addable (it looks) ,
  but actually the "imported" bookmarks from previous opera (12) have the subfolders actually

• no custom info addable .

It's something at least!!
, so i hope they will get better and usable in "real time" while browsing the contents
(otherwise you have to open a new page every time just to look for your categorised bookmarks) .

thank you for the advice.I did not find but still searching.
of course i would have to write "notes" them all again from scratch and cant do it for past stuff
( i imported them though)

Plus i use actually firefox for different tasks, the "not redundant" search ..and work-logins-accounts ,
whereas i'm using opera for personal stuff (personal accounts ,etc , but that's me ) .-

I just express my wish for opera supporting again that feature wich was the core ( be a working extension or whatever).

I did succesfully transferred bookmarks and part of passwords with a PITA process but extensions around are not good ,cant even find the terms i'm looking for searching .. chrome ones included ( no need to comment , there are plenty about that topic).

Hope they will get it again.
**
Opera 12 is a dead end for many webpages sadly (social /yahoo mail etc , half of the time it hangs )
or i would continue to use it , even older versions.

I should thank lem (other topics) for giving links to some extensions.
Though ,
in the most respectful way ,
for many USERS the sidebar is a LIFE of bookmarks categorised
(and for me ) with notes on "PROPERTIES" and edited names and a lot of stuff
(ie = number of cards to check funds , ancient solutions for window troubles ,shops for every category , reminder of the PASSWORDS /user if the page changed and opera cant see the login properly ... and so on)-

I cannot possibly see why NOT to implement again , or at least to find an extension that would show them
on side with properties .
I tried thm all and its not ( "bookmark side panel" does NOT work at all , grey )

Its not a runt , its an hope ,
because opera 12 is almost unusable , slow and becoming really uncompatible , i'm meeting more of it every day sadly