There seems to be a working fix near the bottom of that thread :
https://forums.opera.com/topic/11170/opera-31-broke-the-compatiblity-with-ffmpeg-in-ubuntu-14-04

(see the post from "matthieu1985")

I can confirm that it is not working (Opera 31.0.1889.99).

The "new" Opera doesn't save the web pages content, so there must be another reason for your problem...

That's interesting, I didn't know about that "internal extension" stuff.

That said, the experiment I talked about in my previous message was made on a new installation without any bookmarks/thumbnails.

Anyway I guess I can live with that problem, it's not like my computer is short on memory (8 GB)

I've just made an experiment on a brand new installation of Opera without any bookmarks.

At first it uses very little RAM, then I open the bookmarks tab (Ctrl + Shift + Tab) and just click many times on the different folders, one by one.

Guess what? The "Extension: Bookmarks" memory usage quickly goes up to about 160 MB...

There's obviously something wrong, some memory leak or stuff like that, hopefully the devs will fix that.

I use the MHTML too

The "flags" settings are for experimental features but I didn't have any problem so far with the few ones I enabled.

Yes I have many bookmarks but I don't think it should use so much memory. When I start the browser the bookmarks use less than 20 MB, but the memory usage quickly grows as I start using the bookmarks.

Anyway thanks for your answer.

I use Opera 29 and I just had to enable this flag: opera://flags/#improved-bookmark-popup

No, the "," is a thousands separator, not a decimal point. That's how Opera shows the numbers in the task manager.
It's really 298796 KB (nearly 292 MB).

Hello,

This is with version 29.0.1795.47.

I'm looking at Opera Task Manager and it tells me that "Extension: Bookmarks" is currently using 298,796 KB of RAM! (why it is listed as an extension I don't know, I only use 2 extensions and none of them are bookmarks-related)

I have about 1900 bookmarks, it's much but it shouldn't use nearly 300 MB of RAM... Less than 10 of these bookmarks have a thumbnail picture, in case it matters for RAM usage.

Any idea?