Upgrading to 5.0.0.55 from latest 4.6 went smoothly on my XA2. The browser update seems solid, and I’m glad hardware acceleration for video decoding still works.
Minor browser issues:
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Had DuckDuckGo as search engine, but it no longer works. Selecting something no longer offers the option to search for it. Entering a non-URL expression in the URL bar doesn’t load it in the search engine, instead the native browser tries to load it as a URL. Setting Google as search engine doesn’t change behaviour.
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Reddit videos no longer have audio. Notice that they are muted by default, but with 4.6 it was enough to unmute the embedded video player to have the audio played. Have reproduced this in another user account on the same phone with a pristine Mozilla profile. (This issue seems to be 32bit-specific, as users Xperia 10 II/III reported having no such issues.)