diff --git a/lib/core/engine/collector.js b/lib/core/engine/collector.js
index d3449c01b..54c36e0f3 100644
--- a/lib/core/engine/collector.js
+++ b/lib/core/engine/collector.js
@@ -426,6 +426,17 @@ export class Collector {
         results.geckoPerfStats.push(data.perfStats);
       }
 
+      // Add Firefox cpu power
+      if (data.powerConsumption) {
+        if (!results.powerConsumption) {
+          results.powerConsumption = [];
+        }
+        results.powerConsumption.push(data.powerConsumption);
+        statistics.addDeep({
+          powerConsumption: results.powerConsumption
+        });
+      }
+
       // Add total memory
       if (this.options.firefox && this.options.firefox.memoryReport) {
         statistics.addDeep({
diff --git a/lib/core/engine/command/geckoProfiler.js b/lib/core/engine/command/geckoProfiler.js
index b10ad03e1..c64640794 100644
--- a/lib/core/engine/command/geckoProfiler.js
+++ b/lib/core/engine/command/geckoProfiler.js
@@ -26,7 +26,11 @@ export class GeckoProfiler {
   async stop() {
     if (this.options.browser === 'firefox') {
       if (this.options.firefox.geckoProfilerRecordingType === 'custom') {
-        return this.GeckoProfiler.stop(this.index, this.result[0].url);
+        return this.GeckoProfiler.stop(
+          this.index,
+          this.result[0].url,
+          this.result
+        );
       }
     } else {
       throw new Error('Geckoprofiler only works in Firefox');
diff --git a/lib/firefox/geckoProfiler.js b/lib/firefox/geckoProfiler.js
index 77fbd2f36..ae9b28fd2 100644
--- a/lib/firefox/geckoProfiler.js
+++ b/lib/firefox/geckoProfiler.js
@@ -8,6 +8,26 @@ import { BrowserError } from '../support/errors.js';
 const delay = ms => new Promise(res => setTimeout(res, ms));
 const log = intel.getLogger('browsertime.firefox');
 
+// Return power usage in Wh
+function computePowerSum(counter) {
+  let sum = 0;
+  // Older Firefoxes see https://github.com/sitespeedio/sitespeed.io/issues/3944#issuecomment-1871090793
+  if (counter.sample_groups) {
+    for (const groups of counter.sample_groups) {
+      const countIndex = groups.samples.schema.count;
+      for (const sample of groups.samples.data) {
+        sum += sample[countIndex];
+      }
+    }
+  } else {
+    const countIndex = counter.samples.schema.count;
+    for (const sample of counter.samples.data) {
+      sum += sample[countIndex];
+    }
+  }
+  return sum * 1e-12;
+}
+
 /**
  * Timeout a promise after ms. Use promise.race to compete
  * about the timeout and the promise.
@@ -130,7 +150,7 @@ export class GeckoProfiler {
     return delay(firefoxConfig.geckoProfilerSettleTime || 3000);
   }
 
-  async stop(index, url) {
+  async stop(index, url, result) {
     const runner = this.runner;
     const storageManager = this.storageManager;
     const options = this.options;
@@ -183,6 +203,34 @@ export class GeckoProfiler {
         await android._downloadFile(deviceProfileFilename, destinationFilename);
       }
 
+      if (this.firefoxConfig.powerConsumption === true) {
+        const chosenFeatures = get(
+          this.firefoxConfig,
+          'geckoProfilerParams.features',
+          geckoProfilerDefaults.features
+        );
+        if (chosenFeatures.includes('power')) {
+          log.info('Collecting CPU power consumtion');
+          const profile = JSON.parse(
+            await storageManager.readData(
+              `geckoProfile-${index}.json`,
+              join(pathToFolder(url, options))
+            )
+          );
+          let power = 0;
+          for (const counter of profile.counters) {
+            if (counter.category === 'power') {
+              power += computePowerSum(counter);
+            }
+          }
+          result.powerConsumption = Number(power);
+        } else {
+          log.warning(
+            'Missing power setting in geckoProfilerParams.features so power will not be collected'
+          );
+        }
+      }
+
       // GZIP the profile and remove the old file
       log.info('Gzip file the profile.');
       const name = this.options.enableProfileRun
diff --git a/lib/firefox/webdriver/firefox.js b/lib/firefox/webdriver/firefox.js
index d5ddd8e33..a0753c1b9 100644
--- a/lib/firefox/webdriver/firefox.js
+++ b/lib/firefox/webdriver/firefox.js
@@ -140,7 +140,7 @@ export class Firefox {
       this.firefoxConfig.geckoProfiler &&
       this.firefoxConfig.geckoProfilerRecordingType !== 'custom'
     ) {
-      await this.geckoProfiler.stop(index, url);
+      await this.geckoProfiler.stop(index, url, result);
     }
 
     if (this.firefoxConfig.perfStats) {
diff --git a/lib/support/cli.js b/lib/support/cli.js
index 2ad3b4636..cf29d4286 100644
--- a/lib/support/cli.js
+++ b/lib/support/cli.js
@@ -537,6 +537,13 @@ export function parseCommandLine() {
         'need to specify the logs you wish to gather.',
       group: 'firefox'
     })
+    .option('firefox.powerConsumption', {
+      type: 'boolean',
+      default: false,
+      describe:
+        'Enable power consumption collection (in Wh). To get the consumption you also need to set firefox.geckoProfilerParams.features to include power.',
+      group: 'firefox'
+    })
     .option('firefox.setMozLog', {
       describe:
         'Use in conjunction with firefox.collectMozLog to set MOZ_LOG to something ' +
diff --git a/lib/support/statistics.js b/lib/support/statistics.js
index 095df3f49..ef141a033 100644
--- a/lib/support/statistics.js
+++ b/lib/support/statistics.js
@@ -10,6 +10,10 @@ function validateType(value, type, message) {
   }
 }
 
+function hasDecimals(num) {
+  return num !== Math.floor(num);
+}
+
 function percentileName(percentile) {
   if (percentile === 0) {
     return 'min';
@@ -129,7 +133,7 @@ export class Statistics {
         // https://en.wikipedia.org/wiki/Interquartile_range
         stats = stats.iqr();
       }
-      if (stats.median() < 1 && stats.median() > 0) {
+      if (stats.median() < 10 && stats.median() > 0) {
         decimals = 4;
       }
       const node = {
@@ -165,6 +169,12 @@ export class Statistics {
       }
       if (stats.median() < 1 && stats.median() > 0) {
         decimals = 4;
+      } else if (
+        hasDecimals(stats.median()) &&
+        stats.median() < 100 &&
+        stats.median() > 1
+      ) {
+        decimals = 2;
       }
       const results = {
         median: Number.parseFloat(stats.median().toFixed(decimals)),