Bugzilla

### Steps to reproduce
1. Make sure you have some webpages in your history.
2. In the address bar, try to search something, but make sure the first few letters will trigger an autocomplete at some point.
3. After typing the full search string, press enter

=> Notice that the page to the latest autocompleted page opens, instead of my search

For example at step 1, type https://www.parc-livradois-forez.org/
at step 2, type "parc "
Notice that before the final space, the previous website is completed, but if you type the space it disappears. Still pressing enter will visit it.

I can wait anytime after pressing the space, it will still go to the website.

However if I wait a bit, then press any other character after that, then this will go to search instead.
Also if I press more character than just "parc ", for example "parc de la vill", it will very often to go the website https://www.parc-livradois-forez.org/ instead of searching, but sometimes it will search.

I noticed a few things:
* if I press the backspace key at one point, then it never goes to the website and goes to search always
* I couldn't pinpoint exactly the cases where it is 100% reproducible. I think the STR above makes it 100% reproducible for me.

### Device information

* Firefox version: 147 (nightly from 10/11/2025) but this happens for maybe 2 weeks for me
* Android device model: S12e
* Android OS version: 12

### Steps to reproduce
1. Make sure you have some webpages in your history.
2. In the address bar, try to search something, but make sure the first few letters will trigger an autocomplete at some point.
3. After typing the full search string, press enter

=> Notice that the page to the latest autocompleted page opens, instead of my search

For example at step 1, type https://www.parc-livradois-forez.org/
at step 2, type "parc "
Notice that before the final space, the previous website is completed, but if you type the space it disappears. Still pressing enter will visit it.

I can wait anytime after pressing the space, it will still go to the website.

However if I wait a bit, then press any other character after that, then this will go to search instead.
Also if I press more character than just "parc ", for example "parc de la vill", it will very often to go the website https://www.parc-livradois-forez.org/ instead of searching, but sometimes it will search.

I noticed a few things:
* if I press the backspace key at one point, then it never goes to the website and goes to search always
* I couldn't pinpoint exactly the cases where it is 100% reproducible. I think the STR above makes it 100% reproducible for me.

### Device information

* Firefox version: 147 (nightly from 10/11/2025) but this happens for maybe 2 weeks for me so 146 is also affected. I'm not sure for 145 but I'd say it's not.
* Android device model: S12e
* Android OS version: 12