As far as I can tell, this capability was REMOVED in Opera 55.

It was definitely still present in v. 54, & this was one of my favorite Opera features: easy to find, easy to use, allowing removal of individual cookies or groups of cookies.

The only option I see now is "Clear all cookies." Huge disappointment & big mistake.

Like many of you, I tend to operate with a huge number of open tabs...impossible to manage except in tree mode. I migrated from Firefox to Opera because TreeTabs worked more reliably, but gave up after 2 years full of crashes, lost data, & the author's failure to either maintain the plug-in or respond to user questions & needs.

Kudos to the TreeTabs author for great design, but I vowed never again to rely on a free plug-in for such fundamentally essential functionality.

I moved to Vivaldi nearly a year ago. It's quirky, & I choose to ignore some key features...but a variant of tree-style tabs is built-in & bulletproof. The whole venture is run by Opera veterans, & it shows. I'm satisfied overall, & suggest Vivaldi is worth a serious look.

@thomasmca Got it. Complete & easy fix...much appreciated!

Unrelated: any idea where the "automatic emergency backup" is stored, or how users can designate their own location?

"Emergency" restore options don't work, & frequent manual backups are needed to avoid massive data loss.

Thanks again!

@thomasmca Thanks, Thomas...but I'm confused about implementation. Disabling bookmarks in the sidebar is straightforward, but entering the text shown in the address bar just takes me to an Opera page marked "Experiments" & doesn't appear to actually adjust any settings. What am I missing?

@thomasmca

I'm having same problem...but in my case the left side of the browser was obscured BEHIND the TreeTabs pane. I fixed this by pinning the pane, which just makes Opera skinnier than before.

Pane width can be varied, but there's a minimum setting that's way wider than I'd like.

Sure wish developer would check in to resolve these questions. I'd gladly pay for a fully functional app.

App is well-conceived & well-designed, & would be ESSENTIAL but for a fatal flaw:
the author won't reveal where the "automatic emergency backup" is stored, or allow users to designate a location.

Twice, I've lost hundreds of tabs, none of the "emergency" restore options have worked, & I can't locate the tab list purportedly created (it doesn't appear to be in AppData).

Control of--or developer communication about--this feature is badly needed.

As far as I can tell, this capability was REMOVED in Opera 55.

It was definitely still present in v. 54, & this was one of my favorite Opera features: easy to find, easy to use, allowing removal of individual cookies or groups of cookies.

The only option I see now is "Clear all cookies." Huge disappointment & big mistake.