As a users, I would like to have these features added:

Maintaining bookmarks and notes
- in Menu->Tools, side Notes with Bookmarks. This is useful for maintaining the databases (move or copy folders and records)

Mail searching
- when searching with option “body of message” the search always reads all attachments (included jpg) wasting a lot of time

Mail filter/folder
- in order to help creating RgEx filter formula, should include a brief help on RegEx commands and sintax
- when used in self-learning, would be useful to access and modify autowritten formula
- needed the possibility to copy/move folders
- IMAP account has a separated folder and mails in IMAP account are duplicated: suggest to allow

Mail database
- the mail database is made of huge quantitiy of folders and files that slows the OS when scanning/searching disk and when backing-up: suggest to make a single-file repository on a unique unfragmented disk area

“During Fullscreen mode I often wish I had an easy access bar that I could hover that would drop down the tabs and address bar for tabs open in the current windows, similar to how Firefox manages tabs in Fullscreen mode. I don’t understand why Opera makes this task so out-of-the-way.”

I wait for this feature for more than 4-5 years.
Nice wish-list by the way