diff --git a/mobile/android/android-components/components/feature/summarize/src/main/java/mozilla/components/feature/summarize/ext/Content.kt b/mobile/android/android-components/components/feature/summarize/src/main/java/mozilla/components/feature/summarize/ext/Content.kt
index 5e7df9dd54d97..25ec926ecb015 100644
--- a/mobile/android/android-components/components/feature/summarize/src/main/java/mozilla/components/feature/summarize/ext/Content.kt
+++ b/mobile/android/android-components/components/feature/summarize/src/main/java/mozilla/components/feature/summarize/ext/Content.kt
@@ -15,13 +15,16 @@ internal val PageMetadata.shouldUseReaderModeContent get() = isReaderable && !is
 private val PageMetadata.systemPrompt get() = if (isRecipe) {
     recipeInstructions(language)
 } else {
-    defaultInstructions()
+    defaultInstructions(language)
 }
 
-internal fun defaultInstructions() = """
+internal fun defaultInstructions(language: String) = """
         You are a Content Summarizer. You create mobile-optimized summaries by
         first understanding what users actually need from each type of content.
 
+        You MUST respond entirely in $language. Do not mix languages.
+        Translate all visible section headers and labels into $language.
+
         Process:
         Step 1: Identify and Adapt. Use tree of thought to determine:
         What type of content is this? What would a mobile user want to extract?
@@ -58,7 +61,7 @@ internal fun recipeInstructions(language: String) = """
         You are an expert at creating mobile-optimized recipe summaries.
 
         You MUST respond entirely in $language. Do not mix languages.
-        Translate all visible section headers and labels into **{lang}**.
+        Translate all visible section headers and labels into $language.
         Output ONLY the formatted result. Do not add any closing phrases.
         If a field is null, empty, or missing, omit that section entirely.
         Always replace placeholders with actual values.
diff --git a/mobile/android/android-components/components/feature/summarize/src/test/java/mozilla/components/feature/summarize/SummarizationStoreTest.kt b/mobile/android/android-components/components/feature/summarize/src/test/java/mozilla/components/feature/summarize/SummarizationStoreTest.kt
index 0f5df2dd5869a..2d823d57ec58e 100644
--- a/mobile/android/android-components/components/feature/summarize/src/test/java/mozilla/components/feature/summarize/SummarizationStoreTest.kt
+++ b/mobile/android/android-components/components/feature/summarize/src/test/java/mozilla/components/feature/summarize/SummarizationStoreTest.kt
@@ -176,7 +176,95 @@ class SummarizationStoreTest {
         )
 
         assertEquals(expected, states)
-        assertEquals(Prompt(content, defaultInstructions()), llm.lastPrompt)
+        assertEquals(Prompt(content, defaultInstructions("en")), llm.lastPrompt)
+    }
+
+    @Test
+    fun `page language is forwarded to model for default case`() = runTest {
+        val llm = FakeLlm.successful
+        val provider = FakeCloudProvider(preparedState = CloudLlmProvider.State.Ready(llm))
+        val content = "this is expected content."
+        val pageTitle = "Article Headline"
+        val language = "de"
+        val store = SummarizationStore(
+            initialState = Inert(true),
+            reducer = ::summarizationReducer,
+            middleware = listOf(
+                SummarizationMiddleware(
+                    llmProvider = provider,
+                    settings = SummarizationSettings.inMemory(hasConsentedToShake = true),
+                    contentProvider = { Result.success(Content(PageMetadata(listOf("Article"), 0, language, pageTitle = pageTitle), content)) },
+                    errorReporter = noopReporter,
+                    scope = backgroundScope,
+                    dispatcher = StandardTestDispatcher(testScheduler),
+                ),
+            ),
+        )
+
+        val states = mutableListOf<SummarizationState>()
+        backgroundScope.launch {
+            store.stateFlow.toList(states)
+        }
+        testScheduler.advanceTimeBy(1.seconds)
+
+        store.dispatch(ViewAppeared)
+        testScheduler.advanceTimeBy(15.seconds)
+
+        val expected = listOf<SummarizationState>(
+            Inert(true),
+            Loading(provider.info),
+            Summarizing(provider.info, parser.parse("# $pageTitle\nThis is the article\n")),
+            Summarizing(provider.info, parser.parse("# $pageTitle\nThis is the article\nThis is some content...\n")),
+            Summarizing(provider.info, parser.parse("# $pageTitle\nThis is the article\nThis is some content...\nThis is some *bold* content.\n")),
+            Summarized(provider.info, parser.parse("# $pageTitle\nThis is the article\nThis is some content...\nThis is some *bold* content.\n")),
+        )
+
+        assertEquals(expected, states)
+        assertEquals(Prompt(content, defaultInstructions(language)), llm.lastPrompt)
+    }
+
+    @Test
+    fun `page language is forwarded to model for recipe case`() = runTest {
+        val llm = FakeLlm.successful
+        val provider = FakeCloudProvider(preparedState = CloudLlmProvider.State.Ready(llm))
+        val content = "this is expected content."
+        val pageTitle = "Article Headline"
+        val language = "de"
+        val store = SummarizationStore(
+            initialState = Inert(true),
+            reducer = ::summarizationReducer,
+            middleware = listOf(
+                SummarizationMiddleware(
+                    llmProvider = provider,
+                    settings = SummarizationSettings.inMemory(hasConsentedToShake = true),
+                    contentProvider = { Result.success(Content(PageMetadata(listOf("Recipe"), 0, language, pageTitle = pageTitle), content)) },
+                    errorReporter = noopReporter,
+                    scope = backgroundScope,
+                    dispatcher = StandardTestDispatcher(testScheduler),
+                ),
+            ),
+        )
+
+        val states = mutableListOf<SummarizationState>()
+        backgroundScope.launch {
+            store.stateFlow.toList(states)
+        }
+        testScheduler.advanceTimeBy(1.seconds)
+
+        store.dispatch(ViewAppeared)
+        testScheduler.advanceTimeBy(15.seconds)
+
+        val expected = listOf<SummarizationState>(
+            Inert(true),
+            Loading(provider.info),
+            Summarizing(provider.info, parser.parse("# $pageTitle\nThis is the article\n")),
+            Summarizing(provider.info, parser.parse("# $pageTitle\nThis is the article\nThis is some content...\n")),
+            Summarizing(provider.info, parser.parse("# $pageTitle\nThis is the article\nThis is some content...\nThis is some *bold* content.\n")),
+            Summarized(provider.info, parser.parse("# $pageTitle\nThis is the article\nThis is some content...\nThis is some *bold* content.\n")),
+        )
+
+        assertEquals(expected, states)
+        assertEquals(Prompt(content, recipeInstructions(language)), llm.lastPrompt)
     }
 
     @Test
@@ -322,7 +410,7 @@ class SummarizationStoreTest {
 
         assertTrue(usingReaderContent)
         assertEquals(expected, states)
-        assertEquals(Prompt(content, defaultInstructions()), llm.lastPrompt)
+        assertEquals(Prompt(content, defaultInstructions("en")), llm.lastPrompt)
     }
 
     @Test
@@ -512,7 +600,7 @@ class SummarizationStoreTest {
         )
 
         assertEquals(expected, states)
-        assertEquals(Prompt(content, defaultInstructions()), llm.lastPrompt)
+        assertEquals(Prompt(content, defaultInstructions("en")), llm.lastPrompt)
     }
 
     @OptIn(ExperimentalCoroutinesApi::class)
diff --git a/mobile/android/fenix/app/src/main/java/org/mozilla/fenix/summarization/eligibility/SummarizationEligibilityChecker.kt b/mobile/android/fenix/app/src/main/java/org/mozilla/fenix/summarization/eligibility/SummarizationEligibilityChecker.kt
index 686cee8f9a685..80f71dd70530f 100644
--- a/mobile/android/fenix/app/src/main/java/org/mozilla/fenix/summarization/eligibility/SummarizationEligibilityChecker.kt
+++ b/mobile/android/fenix/app/src/main/java/org/mozilla/fenix/summarization/eligibility/SummarizationEligibilityChecker.kt
@@ -72,7 +72,7 @@ internal class DefaultSummarizationEligibilityChecker : SummarizationEligibility
         return wordCount in WORD_COUNT_RANGE && language.inAcceptedLanguages()
     }
 
-    private fun String.inAcceptedLanguages() = listOf("en").any { acceptedLang ->
+    private fun String.inAcceptedLanguages() = listOf("en", "fr", "es", "pt", "de", "ja").any { acceptedLang ->
         this.contains(acceptedLang)
     }