Vote which feature you want the most.
Add really private window. Under 'Open private window' add menu position 'Open extra private window' (or different name you find suitable) - it will open completly clean private window - without history and search suggestions. So when somebody asks me to check something on the net I can open him this extra private window without all my data. Currently private window has access to all my history, passwords etc.
Please make password manager like in the old Opera. With separate button and shortcut for filling passwords. Managing multiple accounts was much easier. And login wasn't visible to everyone.
Add option to set a static grid on SpeedDial (n x m, ie. 5 x 9) and put thumbnails anywhere on this SpeedDial grid (with unused cells invisible). It will work very well with custom backgrounds (you could remove thumnails covering important parts of the picture). Currently you can only place thumbnails in linear fashion and they change their position when you change size of the window or open side panel (what’s the point of SpeedDial tiles when they change their position on the grid when you change window size and you have to search through them?).
Add option on SpeedDial to change URL of tile. Should be in right click menu.
Vivaldi should be first sugesting currently open tabs for SpeedDial when adding a new SpeedDial entry using the big plus button (currently it suggest miniatures of apparently some random pages from history). Or allow dragging tab from tab bar to add it as a new SpeedDial entry.
Add warning when closing Vivaldi when file is downloading.
Download folder should be chosen from list of folders on your PC - you should not expect people to type it down manually. Especially that it's not working. I wanted to save to desktop, I wrote path to desktop but files are not appearing on desktop. Instead a second desktop folder is created in my user profile and files are saved there.
When starting download option 'open' should be renamed to 'save and open' - because it's saving the file to download folder and opening it, not to some temp folder where it gets deleted after viewing.
Add option to see picture data via right click menu (i.e. size, resolution, etc).
Status bar improvements (this bar at the bottom with zooming etc.).
1.Allow to move it from the bottom to below the URL bar.
2.Add button on the right of URL bar to show/hide status bar.
3.Allow to customize status bar (add/remove other options besides zooming and tiles).
4.Add option to show link's URL close to the link instead of on status bar (looking at the bottom is inconvenient).
Give option to move button for opening new tabs (plus button) in front of tabs (now it's always behind them) or on the bar with back/forward buttons (put it in front of them).
Double click on tab bar should open a new tab.
Moving cursor over tab's thumbnail should show this particular tab in background (because thumbnails are sometimes unreliable). Currently it’s impossible to move cursor over thumbnail.
Add option in context menu to open tab in different browser (i.e. Edge). Because Vivaldi still has some serious problems with some websites - that way people can still use Vivaldi as everyday browser and switch to other browser only when they encounter problematic website.
Some improvements to tab closing. When the bar is full of tabs after closing a tab other tabs keep their size as long as you keep cursor over them - but all tabs on the right move to fill the space. Tabs should hold their position (with blank spaces for closed tabs). It would make selecting and closing tabs much easier.
Add option to search for two different phrases on one page (higlighted with two different colors).
Add option in settings to disable autofill in text boxes on pages.
Add button to enable/disable Java/Flash. It should be placed next to URL bar and change color when website is using Java/Flash and you've got them disabled.
Wrong naming of key shortcuts - 'Next tab (recent)' and 'Previous tab (recet)' are switched (I've got 'Cycle in tab order' selected).
Autocompletion should suggest most common url from history (with main pages taking priority over subpages).
If you think a feature is useful and missing in Vivaldi, please make a request.
How to make a feature request for Vivaldi
If you think your problem can be solved by a missing feature, please add each request seperatly at https://forum.vivaldi.net/category/48/features-requests in the corresponding thread for your browser version.