I finally found the solution:
There is a blue vertical bar right under the Opera-window closing button (red "X").

Didn't even thought this was a button at first.

I clicked it and the quick access to the extensions reappeared. -> Just need to click on the cube and then on the extension, just like in the other browsers.

I hope this is helpful if someone has the same problem.

@mr-panther You can also try installing ad-blocker extensions. uBlock Origin seems to work great till now.

I finally found the solution:
There is a blue vertical bar right under the Opera-window closing button (red "X").

Didn't even thought this was a button at first.

I clicked it and the quick access to the extensions reappeared. -> Just need to click on the cube and then on the extension, just like in the other browsers.

I hope this is helpful if someone has the same problem.

Not sure if this is what you need, but if you want a website blocker that is always tuned on, you could try "Cold Turky Blocker". It is an external app that closes the browser when you disable the web blocking extension. It is hard to delete if the blocking is active. It also blocks other browsers. You can set requirements to change the block-list for example like "only at 4am" , " "in 1 week". Theres a free and a payed version. Lately it makes opera crash about twice a day, but it is sill worth it. And maybe it will work better for you.

@fredthemailman I als have uBlock origin installed and opera works fine.

@mr-panther You can also try installing ad-blocker extensions. uBlock Origin seems to work great till now.

Description: I want to access the extension settings of a extension called "Limit - Set Limits for Distracting Sites" On the opera://extensions/ site there is no "Options/Settings" button under the listed Extension. Half a year ago, I could access the settings trough the extentions-button next to the seach-bar/url-bar. Through an update, his extension button got moved to the sidebar and since then it just redirects to the opera://extensions/ site. There is no option to enter the settings of the Extension anymore. In Edge it still works like in the old Opera version.

Are there other ways to enter the settings?

Steps to reproduce: To see how it should work try installing the extension in a different browser - click on the extension button - click on the "Limit" Extension - a box will open - click open settings - you get redirected to the settings page extension://cljdjojmjdnlmggficioagingmjdfphe/html/settings.html (copying the link from edge to opera doesn't work)

Actual result: I get redirected to the opera://extensions/ site - I found no way to enter the settings page.

Expected result: the settings should open (like described in "steps to reproduce"

OS: Windows 10

Version of Opera: 108.0.5067.29