this is only a failure on android when browser.tabs.remote=false.
Can you post the data: urls for the test and the reference?
Looks like a text anti-aliasing problem, not a real test failure. Perhaps adding a fuzzy(...) in the manifest could make it succeed?
:ajuma, can you advise on some fuzzy parameters?
fuzzy-if(android,9,2125) will make this pass.
Created attachment 632680 [details] [diff] [review] updated reftest manifest (1.0)