In Proton UI tabs are not highlighted by a color of container

[achernyakevich-sc]

• Multi-Account Containers Version: 7.4.0
• Operating System + Version: Windows 10, 21H1
• Firefox Version: 91.0
• Other installed Add-ons + Version + Enabled/Disabled-Status:
  Russian spellchecking dictionary dictionary 0.4.5.1webext true ru@dictionaries.addons.mozilla.org
  Amazon.com extension 1.3 true amazondotcom@search.mozilla.org
  Bing extension 1.3 true bing@search.mozilla.org
  DuckDuckGo extension 1.1 true ddg@search.mozilla.org
  Feedbro extension 4.9.10 true {a9c2ad37-e940-4892-8dce-cd73c6cbbc0c}
  Firefox Multi-Account Containers extension 7.4.0 true @testpilot-containers
  FoxyProxy Standard extension 7.5.1 true foxyproxy@eric.h.jung
  Google extension 1.1 true google@search.mozilla.org
  KeePassXC-Browser extension 1.7.9.1 true keepassxc-browser@keepassxc.org
  Open in Sidebar extension 2019.7.8 true open-link-in-sidebar@afnankhan
  Simple Tab Groups extension 4.7 true simple-tab-groups@drive4ik
  Simple Translate extension 2.5.3 true simple-translate@sienori
  Tampermonkey extension 4.13.6136 true firefox@tampermonkey.net
  User-Agent Switcher extension 1.4.1 true user-agent-switcher@ninetailed.ninja
  Wikipedia (en) extension 1.1 true wikipedia@search.mozilla.org
  Yandex extension 1.2 true yandex@search.mozilla.org

Actual behavior

In Proton UI tabs are not highlighted by a color of container:

Expected behavior

As container "Scand" has blue color then tab should have some blue color highlighting the tab. In earlier version it was blue tab border.

Steps to reproduce

1. Install Firefox 91.0.
2. Open tab of the container.
3. No visual highlighting.

Notes

Earlier highlighting was implemented as one colored border. Maybe there is a reason to highlight all boarders of the tab because in Proton UI tab selector looks like a independent button.

[achernyakevich]

As we could see that there was at least two other issues related to the same problem cause by forcing Proton UI to be turned on for everybody. It is really pity that to find which container tab belongs to you need to open this tab and look to URL field. :(

[shadowmage45]

I found that if I open about:config, and search for 'Proton', I was able to restore the above-tab color bar for containers by enabling the 'browser.proton.enabled' setting (previously was set to disabled, likely by me trying to fix some other Proton UI issues...).

Hope this helps...

[achernyakevich]

I found that if I open about:config, and search for 'Proton', I was able to restore the above-tab color bar for containers by enabling the 'browser.proton.enabled' setting (previously was set to disabled, likely by me trying to fix some other Proton UI issues...).

Hope this helps...

Thanks for your screenshot. I have rechecked my settings about Proton and have found that I have kept browser.proton.enabled set to false after my attempts to disable Proton UI. I did it because new tabs decoupled from page itself look really bad. But after update to Firefox 91 I have found that this setting do not disable Proton. :(

So our joint research results are:

• if browser.proton.enabled=true (Proton is enabled) then tabs are colored.
• if browser.proton.enabled=false (Proton expected to be disabled but in reality is not) then tabs coloring does not work.

I'm not sure will developers of this add-on treat as a bug. But if possible I would like have tabs colored even if browser.proton.enabled set to false.

[dtar2]

Thank you @shadowmage45 and @achernyakevich. I have also confirmed these results. Setting browser.proton.enabled=true allows the tab colors to be displayed.

[arnofly]

Thank you too @shadowmage45. That's fix the "bug". Photon was definitively a better UI than Proton. That's why I set this variable to FALSE, as many people I think so... Mozilla loose users year after year, but don't care about opinion of historic users.

For me, the color line at the bottom of the tab was more readable (i am web developer).

[achernyakevich-sc]

@arnofly BTW: the following issue and its comments could be useful for you - #2121

It provides info how to customize Firefox UI and color stripes for tabs of container (see, #2121 (comment) comment).

[dannycolin]

Closing since this was a Firefox issue.