diff --git a/.github/workflows/_test.yml b/.github/workflows/_test.yml
index 406d47ef4..e16375e53 100644
--- a/.github/workflows/_test.yml
+++ b/.github/workflows/_test.yml
@@ -63,6 +63,7 @@ jobs:
         with: { name: all-builds }
       - uses: cypress-io/github-action@v7
         with:
+          browser: chrome
           working-directory: webapp
           install: false
           start: pnpm exec vite --mode test --port 1351
@@ -85,6 +86,7 @@ jobs:
         env:
           DISCO_TRAINING_E2E: "1"
         with:
+          browser: chrome
           working-directory: webapp
           install: false
           start: pnpm exec vite --mode test --port 1351
@@ -111,6 +113,7 @@ jobs:
           DISCO_SCRIPTED_SERVER_E2E: "1"
           VITE_SERVER_URL: http://server:8080
         with:
+          browser: chrome
           working-directory: webapp
           install: false
           start: pnpm exec vite --mode test --port 1351
@@ -142,6 +145,7 @@ jobs:
           DISCO_TRAINING_E2E: "1"
           DISCO_E2E_FEDERATED_TASK: ${{ matrix.task }}
         with:
+          browser: chrome
           working-directory: webapp
           install: false
           start: >-
diff --git a/.github/workflows/record-cypress.yml b/.github/workflows/record-cypress.yml
index f737d29e8..248b12bf4 100644
--- a/.github/workflows/record-cypress.yml
+++ b/.github/workflows/record-cypress.yml
@@ -23,6 +23,7 @@ jobs:
       - run: pnpm -F webapp run test:unit
       - uses: cypress-io/github-action@v7
         with:
+          browser: chrome
           working-directory: webapp
           install: false
           start: pnpm start
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index 9fb2d2be2..016c4d569 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -129,6 +129,19 @@ Federated training tests run in separate CI jobs for Titanic and LUS COVID.
 Each job starts a real server and a Node participant configured for its task;
 see `test-e2e-federated` in `.github/workflows/_test.yml` for the setup.
 
+##### Running with a specific browser
+
+In CI, Cypress workflows run in Google Chrome (`browser: chrome`).
+
+When running end-to-end training tests locally, you can select which browser to run with using the `DISCO_E2E_BROWSER` environment variable (e.g. `chrome`, `firefox`, `edge`):
+
+```sh
+DISCO_E2E_BROWSER=firefox pnpm -F webapp run test:e2e:local
+DISCO_E2E_BROWSER=chrome pnpm -F webapp run test:e2e:local
+```
+
+On Linux, running image tasks (such as LUS COVID) with real browsers like Chrome or Firefox is recommended over headless Electron to leverage hardware WebGL acceleration and avoid CPU software fallback stalls.
+
 #### Cypress and Github Actions
 
 It is possible to record the cypress tests ran in the Github Actions CI and visualize them in the [Cypress Cloud](cloud.cypress.io). It is currently used only when needed (because the free plan has a limited number of recordings). The [cypress documentation](https://docs.cypress.io/app/continuous-integration/github-actions) describes how to set up the recordings.
diff --git a/webapp/cypress.config.ts b/webapp/cypress.config.ts
index 738464585..0f4593bf7 100644
--- a/webapp/cypress.config.ts
+++ b/webapp/cypress.config.ts
@@ -51,6 +51,8 @@ if (
   );
 
 export default defineConfig({
+  defaultBrowser: process.env.DISCO_E2E_BROWSER,
+
   // Cypress.env() is deprecated throw; use cy.env() for sensitive values
   // and Cypress.expose() otherwise
   // allowCypressEnv will be removed in v16.0 so delete this line at that point