[Firefox] Open tabs in the same container as the original tab

**Is your feature request related to a problem? Please describe.**
I'm using the Tab search mode and when I click on Wayback Machine/Google/etc. a new tab opens in No Container no matter what container the current tab was in.

**Describe the solution you'd like**
An option to open new tabs in the same container as the current tab (when the Tab search mode is active).

**Describe alternatives you've considered**
N/A, but probably [Temporary Containers](https://github.com/stoically/temporary-containers) is able to automatically re-open these tabs in a new temporary container(s). Not the same as proposed, but still better than No Container.

**Additional context**
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_contextual_identities

Start with the Tab search mode implementation and the Firefox extension handling for opening results, then read the linked MDN documentation on contextual identities. The work is done when an option opens newly selected pages in the current tab's container while Tab search mode is active, without changing behavior for other modes.

Written by the indexing model from the issue text.