Global technology/business coverage. Sources checked 13 October 2026.

A translated webpage can help a reader enter an unfamiliar topic, but an important sentence still deserves its original wording. Mozilla’s Firefox Translations guide describes both translation and a way to return to the original page. For a reader comparing product or business information across languages, retaining that source text is a practical habit. It separates a reading aid from a verified interpretation of what the publisher said.

The support guide describes the scope

Mozilla’s Firefox Translations guide describes translation on the device, supported content after language files are installed, full-page and selected-text translation, and a Show original option. It also says translation concerns text rather than images or videos and notes possible errors with context or mixed languages. These are Mozilla’s descriptions, not results from a browser or language-pair test conducted here.

Keep a source sentence beside the interpretation

For a proposed research note, retain the original sentence, its page URL and the date checked. Place the translated reading alongside it, clearly labelled. If the sentence concerns a model name, date, qualification or exception, keep enough surrounding text to understand its context. A fluent translation can still leave an ambiguity that requires another source or a person competent in the language.

This is especially useful when a short statement becomes central to a comparison. The reader can distinguish the publisher’s wording from the interpretation used in the article. Do not silently promote a browser translation into an official translation issued by the brand or institution. If the publisher offers its own language version, identify that version separately and check whether its scope matches.

Supported language is not an accuracy guarantee

A translation direction appearing in a tool is evidence of a supported function, not a guarantee that every sentence will be rendered correctly. The guide itself acknowledges context and mixed-language problems. If a result changes the practical meaning of a statement, treat that as a reason for clarification rather than choosing whichever phrasing seems more convenient.

A bounded comparison could examine a defined set of noncritical text with a qualified reference interpretation. That would be an actual accuracy evaluation, and it would need a transparent method. This article performed none. It supplies no score, language ranking or claim about how a particular industry’s terminology is handled.

On-device processing answers a different question

Mozilla’s processing description concerns the translation feature’s architecture. It should not be expanded into a certification of all browser activity, all extensions or an organisation’s handling of sensitive material. Those questions need their own review. Likewise, offline translation after necessary files are available does not establish that an unprepared device can translate every page in every language without a connection.

The useful reader workflow is modest: use translation to understand, retain the original when a sentence matters, and seek clarification when uncertainty affects the conclusion. Firefox’s documented original-language route supports that workflow. It does not replace the source, establish a legally authoritative wording or prove an untested translation’s accuracy.

Sources and scope

• MozillaSupport:FirefoxTranslations — Live Mozilla support guide checked 2026-10-13; no absolute publication date inferred

Current Mozilla support description, not a translation accuracy test or browser privacy audit. No language pair, page, mobile entitlement or sensitive document was evaluated.

Related coverage: Guides archive.