No warning when opening many bookmarks

[Fabian42]

Before submitting a bug report

• I updated to the latest version of Multi-Account Container and tested if I can reproduce the issue
• I searched for existing reports to see if it hasn't already been reported

Step to reproduce

1. Right-click on a bookmark folder with 15+ bookmarks
2. Select "Open bookmark* in container tab" and any option.

Actual behavior

No warning, all of them open immediately in that container.

Expected behavior

"You are about to open [number] tabs. This might slow down Firefox while the pages are loading. Are you sure you want to continue?", like when opening all bookmarks in a folder regularly.

Additional informations

I just did that accidentally with 72 pages, luckily I didn't click on my 20000 bookmark folder…

Provide a copy of Troubleshooting Information page (optional)

No response