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日本語でfirefoxを利用しています。 よく文章を入力欄に日本語で打ち込んでいると、赤い波の下線が引かれます。それがスペルチェックであることは知っているのですが、具体的にどんな基準で正誤を判断しているのかもわかりません。かと言って修正してくれるわけでもないのでオフにしようと思うのですが、その前にこの機能がどういう性質のものかは知っておきたいです。

例えばなんの問題もないように見える 

「りんごは美味しい。」 という文章もこの機能によると間違っていると表示されます。 「。」記号を抜くと下線は消えたりとよくわからない機能です。

これは果たして有用ですか？

追記、日本語辞書はfirefoxにダウンロードされていると思います。

Environment: - Firefox 157.0.1 (64-bit) - Windows 11 (build 26100) - IME: Microsoft Pinyin (TSF)

Steps to reproduce: 1. Open any page with a text input (e.g. chat.deepseek.com). 2. Type quickly in Chinese Pinyin, e.g. "zuihou". 3. At some point during composition, the current composition ("zu") is committed as raw pinyin (with the apostrophe separator preserved), and the next key ("i") starts a new composition.

Expected behavior: - The composition should continue normally, and all keys should be consumed by the IME. - No raw pinyin string should ever be committed.

Actual behavior: - Firefox delivers the key event to the web page with keyCode 73 ("i") instead of keyCode 229 (Process), so the IME never receives it. - The IME's internal composition state stays at "zu" while the browser display has already moved on. - When the next key arrives, the IME commits the stale "zu" as raw pinyin and starts a new composition. - This results in the composition being split into two parts, with the first part committed as raw pinyin containing the "'" separator.

Additional context: - The problem occurs only in Firefox. In Edge (Chromium) on the same machine, typing the same sequence for several minutes never reproduces it. - It does not occur with every key; only certain keystrokes are affected, and it seems to require fast typing. - The issue is not caused by keyboard hardware, third-party software (AutoHotkey, yasb, PixPin, Intel drivers, MuMu), or key injection. A low-level keyboard hook log shows no injected events (inj=0 for all 204 keystrokes).

Log excerpt (from a JS composition probe injected into the page): [ime] 04:20:54.740 keydown key=Process isComposing=false keyCode=229 repeat=false [ime] 04:20:54.740 COMPOSITIONSTART data="" [ime] 04:20:54.741 compositionupdate data="z" [ime] 04:20:54.831 keydown key=Process isComposing=true keyCode=229 repeat=false [ime] 04:20:54.833 compositionupdate data="zu" [ime] 04:20:54.928 keydown key=i isComposing=true keyCode=73 repeat=false <-- key 73, not 229 [ime] 04:20:55.324 keydown key=Process isComposing=true keyCode=229 repeat=false [ime] 04:20:55.326 COMPOSITIONEND data="zu" <-- stale composition committed [ime] 04:20:55.327 COMPOSITIONSTART data="" [ime] 04:20:55.327 compositionupdate data="h"

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Bonjour,

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