New tabs' layout is broken when RFP is off
Noticed by @richard in 12.5a7: if you start the browser with browser.privacy.resistFingerprinting set to false, new tabs in the first window are broken (their content's width is forced to 0).
Noticed by @richard in 12.5a7: if you start the browser with browser.privacy.resistFingerprinting set to false, new tabs in the first window are broken (their content's width is forced to 0).