Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 1409 insertions, 0 deletions

diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/__init__.py b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/__init__.py
new file mode 100644
index 0000000000..ce0337db09
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/__init__.py
@@ -0,0 +1,17 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""
+mozgeckoprofiler has utilities to symbolicate and load gecko profiles.
+"""
+from .profiling import save_gecko_profile, symbolicate_profile_json
+from .symbolication import ProfileSymbolicator
+from .viewgeckoprofile import view_gecko_profile
+
+__all__ = [
+    "save_gecko_profile",
+    "symbolicate_profile_json",
+    "ProfileSymbolicator",
+    "view_gecko_profile",
+]
diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/dump_syms_mac b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/dump_syms_mac
new file mode 100755
index 0000000000..e9b8edf879
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/dump_syms_mac
diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/profiling.py b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/profiling.py
new file mode 100644
index 0000000000..fca7465d23
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/profiling.py
@@ -0,0 +1,85 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import json
+import os
+import shutil
+import tempfile
+
+from mozlog import get_proxy_logger
+
+from .symbolication import ProfileSymbolicator
+
+LOG = get_proxy_logger("profiler")
+
+
+def save_gecko_profile(profile, filename):
+    with open(filename, "w") as f:
+        json.dump(profile, f)
+
+
+def symbolicate_profile_json(profile_path, objdir_path):
+    """
+    Symbolicate a single JSON profile.
+    """
+    temp_dir = tempfile.mkdtemp()
+    missing_symbols_zip = os.path.join(temp_dir, "missingsymbols.zip")
+
+    firefox_symbol_path = os.path.join(objdir_path, "dist", "crashreporter-symbols")
+    if not os.path.isdir(firefox_symbol_path):
+        os.mkdir(firefox_symbol_path)
+
+    windows_symbol_path = os.path.join(temp_dir, "windows")
+    os.mkdir(windows_symbol_path)
+
+    symbol_paths = {"FIREFOX": firefox_symbol_path, "WINDOWS": windows_symbol_path}
+
+    symbolicator = ProfileSymbolicator(
+        {
+            # Trace-level logging (verbose)
+            "enableTracing": 0,
+            # Fallback server if symbol is not found locally
+            "remoteSymbolServer": "https://symbols.mozilla.org/symbolicate/v4",
+            # Maximum number of symbol files to keep in memory
+            "maxCacheEntries": 2000000,
+            # Frequency of checking for recent symbols to
+            # cache (in hours)
+            "prefetchInterval": 12,
+            # Oldest file age to prefetch (in hours)
+            "prefetchThreshold": 48,
+            # Maximum number of library versions to pre-fetch
+            # per library
+            "prefetchMaxSymbolsPerLib": 3,
+            # Default symbol lookup directories
+            "defaultApp": "FIREFOX",
+            "defaultOs": "WINDOWS",
+            # Paths to .SYM files, expressed internally as a
+            # mapping of app or platform names to directories
+            # Note: App & OS names from requests are converted
+            # to all-uppercase internally
+            "symbolPaths": symbol_paths,
+        }
+    )
+
+    LOG.info(
+        "Symbolicating the performance profile... This could take a couple "
+        "of minutes."
+    )
+
+    try:
+        with open(profile_path, "r", encoding="utf-8") as profile_file:
+            profile = json.load(profile_file)
+        symbolicator.dump_and_integrate_missing_symbols(profile, missing_symbols_zip)
+        symbolicator.symbolicate_profile(profile)
+        # Overwrite the profile in place.
+        save_gecko_profile(profile, profile_path)
+    except MemoryError:
+        LOG.error(
+            "Ran out of memory while trying"
+            " to symbolicate profile {0}".format(profile_path)
+        )
+    except Exception as e:
+        LOG.error("Encountered an exception during profile symbolication")
+        LOG.error(e)
+
+    shutil.rmtree(temp_dir)
diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symFileManager.py b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symFileManager.py
new file mode 100644
index 0000000000..e93cbc7b02
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symFileManager.py
@@ -0,0 +1,353 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import itertools
+import os
+import re
+import threading
+import time
+from bisect import bisect
+
+from mozlog import get_proxy_logger
+
+LOG = get_proxy_logger("profiler")
+
+# Libraries to keep prefetched
+PREFETCHED_LIBS = ["xul.pdb", "firefox.pdb"]
+
+
+class SymbolInfo:
+    def __init__(self, addressMap):
+        self.sortedAddresses = sorted(addressMap.keys())
+        self.sortedSymbols = [addressMap[address] for address in self.sortedAddresses]
+        self.entryCount = len(self.sortedAddresses)
+
+    # TODO: Add checks for address < funcEnd ?
+    def Lookup(self, address):
+        nearest = bisect(self.sortedAddresses, address) - 1
+        if nearest < 0:
+            return None
+        return self.sortedSymbols[nearest]
+
+    def GetEntryCount(self):
+        return self.entryCount
+
+
+# Singleton for .sym / .nmsym file cache management
+
+
+class SymFileManager:
+    """This class fetches symbols from files and caches the results.
+
+    options (obj)
+        symbolPaths : dictionary
+            Paths to .SYM files, expressed internally as a mapping of app or platform
+            names to directories. App & OS names from requests are converted to
+            all-uppercase internally
+            e.g. { "FIREFOX": "/tmp/path" }
+        maxCacheEntries : number
+            Maximum number of symbol files to keep in memory
+        prefetchInterval : number
+            Frequency of checking for recent symbols to cache (in hours)
+        prefetchThreshold : number
+            Oldest file age to prefetch (in hours)
+        prefetchMaxSymbolsPerLib : (number)
+            Maximum number of library versions to pre-fetch per library
+    """
+
+    sCache = {}
+    sCacheCount = 0
+    sCacheLock = threading.Lock()
+    sMruSymbols = []
+
+    sOptions = {}
+    sCallbackTimer = None
+
+    def __init__(self, options):
+        self.sOptions = options
+
+    def GetLibSymbolMap(self, libName, breakpadId, symbolSources):
+        # Empty lib name means client couldn't associate frame with any lib
+        if libName == "":
+            return None
+
+        # Check cache first
+        libSymbolMap = None
+        self.sCacheLock.acquire()
+        try:
+            if libName in self.sCache and breakpadId in self.sCache[libName]:
+                libSymbolMap = self.sCache[libName][breakpadId]
+                self.UpdateMruList(libName, breakpadId)
+        finally:
+            self.sCacheLock.release()
+
+        if libSymbolMap is None:
+            LOG.debug("Need to fetch PDB file for " + libName + " " + breakpadId)
+
+            # Guess the name of the .sym or .nmsym file on disk
+            if libName[-4:] == ".pdb":
+                symFileNameWithoutExtension = re.sub(r"\.[^\.]+$", "", libName)
+            else:
+                symFileNameWithoutExtension = libName
+
+            # Look in the symbol dirs for this .sym or .nmsym file
+            for extension, source in itertools.product(
+                [".sym", ".nmsym"], symbolSources
+            ):
+                symFileName = symFileNameWithoutExtension + extension
+                pathSuffix = (
+                    os.sep + libName + os.sep + breakpadId + os.sep + symFileName
+                )
+                path = self.sOptions["symbolPaths"][source] + pathSuffix
+                libSymbolMap = self.FetchSymbolsFromFile(path)
+                if libSymbolMap:
+                    break
+
+            if not libSymbolMap:
+                LOG.debug("No matching sym files, tried " + str(symbolSources))
+                return None
+
+            LOG.debug(
+                "Storing libSymbolMap under [" + libName + "][" + breakpadId + "]"
+            )
+            self.sCacheLock.acquire()
+            try:
+                self.MaybeEvict(libSymbolMap.GetEntryCount())
+                if libName not in self.sCache:
+                    self.sCache[libName] = {}
+                self.sCache[libName][breakpadId] = libSymbolMap
+                self.sCacheCount += libSymbolMap.GetEntryCount()
+                self.UpdateMruList(libName, breakpadId)
+                LOG.debug(
+                    str(self.sCacheCount)
+                    + " symbols in cache after fetching symbol file"
+                )
+            finally:
+                self.sCacheLock.release()
+
+        return libSymbolMap
+
+    def FetchSymbolsFromFile(self, path):
+        try:
+            symFile = open(path, "r")
+        except Exception as e:
+            LOG.debug("Error opening file " + path + ": " + str(e))
+            return None
+
+        LOG.debug("Parsing SYM file at " + path)
+
+        try:
+            symbolMap = {}
+            lineNum = 0
+            publicCount = 0
+            funcCount = 0
+            if path.endswith(".sym"):
+                for line in symFile:
+                    lineNum += 1
+                    if line[0:7] == "PUBLIC ":
+                        line = line.rstrip()
+                        fields = line.split(" ")
+                        if len(fields) < 4:
+                            LOG.debug("Line " + str(lineNum) + " is messed")
+                            continue
+                        if fields[1] == "m":
+                            address = int(fields[2], 16)
+                            symbolMap[address] = " ".join(fields[4:])
+                        else:
+                            address = int(fields[1], 16)
+                            symbolMap[address] = " ".join(fields[3:])
+                        publicCount += 1
+                    elif line[0:5] == "FUNC ":
+                        line = line.rstrip()
+                        fields = line.split(" ")
+                        if len(fields) < 5:
+                            LOG.debug("Line " + str(lineNum) + " is messed")
+                            continue
+                        if fields[1] == "m":
+                            address = int(fields[2], 16)
+                            symbolMap[address] = " ".join(fields[5:])
+                        else:
+                            address = int(fields[1], 16)
+                            symbolMap[address] = " ".join(fields[4:])
+                        funcCount += 1
+            elif path.endswith(".nmsym"):
+                addressLength = 0
+                for line in symFile:
+                    lineNum += 1
+                    if line.startswith(" "):
+                        continue
+                    if addressLength == 0:
+                        addressLength = line.find(" ")
+                    address = int(line[0:addressLength], 16)
+                    # Some lines have the form
+                    # "address space letter space symbol",
+                    # some have the form "address space symbol".
+                    # The letter has a meaning, but we ignore it.
+                    if line[addressLength + 2] == " ":
+                        symbol = line[addressLength + 3 :].rstrip()
+                    else:
+                        symbol = line[addressLength + 1 :].rstrip()
+                    symbolMap[address] = symbol
+                    publicCount += 1
+        except Exception:
+            LOG.error("Error parsing SYM file " + path)
+            return None
+
+        logString = "Found " + str(len(symbolMap)) + " unique entries from "
+        logString += (
+            str(publicCount) + " PUBLIC lines, " + str(funcCount) + " FUNC lines"
+        )
+        LOG.debug(logString)
+
+        return SymbolInfo(symbolMap)
+
+    def PrefetchRecentSymbolFiles(self):
+        """This method runs in a loop. Use the options "prefetchThreshold" to adjust"""
+        global PREFETCHED_LIBS
+
+        LOG.info("Prefetching recent symbol files")
+        # Schedule next timer callback
+        interval = self.sOptions["prefetchInterval"] * 60 * 60
+        self.sCallbackTimer = threading.Timer(interval, self.PrefetchRecentSymbolFiles)
+        self.sCallbackTimer.start()
+
+        thresholdTime = time.time() - self.sOptions["prefetchThreshold"] * 60 * 60
+        symDirsToInspect = {}
+        for pdbName in PREFETCHED_LIBS:
+            symDirsToInspect[pdbName] = []
+            topLibPath = self.sOptions["symbolPaths"]["FIREFOX"] + os.sep + pdbName
+
+            try:
+                symbolDirs = os.listdir(topLibPath)
+                for symbolDir in symbolDirs:
+                    candidatePath = topLibPath + os.sep + symbolDir
+                    mtime = os.path.getmtime(candidatePath)
+                    if mtime > thresholdTime:
+                        symDirsToInspect[pdbName].append((mtime, candidatePath))
+            except Exception as e:
+                LOG.error("Error while pre-fetching: " + str(e))
+
+            LOG.info(
+                "Found "
+                + str(len(symDirsToInspect[pdbName]))
+                + " new "
+                + pdbName
+                + " recent dirs"
+            )
+
+            # Only prefetch the most recent N entries
+            symDirsToInspect[pdbName].sort(reverse=True)
+            symDirsToInspect[pdbName] = symDirsToInspect[pdbName][
+                : self.sOptions["prefetchMaxSymbolsPerLib"]
+            ]
+
+        # Don't fetch symbols already in cache.
+        # Ideally, mutex would be held from check to insert in self.sCache,
+        # but we don't want to hold the lock during I/O. This won't cause
+        # inconsistencies.
+        self.sCacheLock.acquire()
+        try:
+            for pdbName in symDirsToInspect:
+                for (mtime, symbolDirPath) in symDirsToInspect[pdbName]:
+                    pdbId = os.path.basename(symbolDirPath)
+                    if pdbName in self.sCache and pdbId in self.sCache[pdbName]:
+                        symDirsToInspect[pdbName].remove((mtime, symbolDirPath))
+        finally:
+            self.sCacheLock.release()
+
+        # Read all new symbol files in at once
+        fetchedSymbols = {}
+        fetchedCount = 0
+        for pdbName in symDirsToInspect:
+            # The corresponding symbol file name ends with .sym
+            symFileName = re.sub(r"\.[^\.]+$", ".sym", pdbName)
+
+            for (mtime, symbolDirPath) in symDirsToInspect[pdbName]:
+                pdbId = os.path.basename(symbolDirPath)
+                symbolFilePath = symbolDirPath + os.sep + symFileName
+                symbolInfo = self.FetchSymbolsFromFile(symbolFilePath)
+                if symbolInfo:
+                    # Stop if the prefetched items are bigger than the cache
+                    if (
+                        fetchedCount + symbolInfo.GetEntryCount()
+                        > self.sOptions["maxCacheEntries"]
+                    ):
+                        break
+                    fetchedSymbols[(pdbName, pdbId)] = symbolInfo
+                    fetchedCount += symbolInfo.GetEntryCount()
+                else:
+                    LOG.error("Couldn't fetch .sym file symbols for " + symbolFilePath)
+                    continue
+
+        # Insert new symbols into global symbol cache
+        self.sCacheLock.acquire()
+        try:
+            # Make room for the new symbols
+            self.MaybeEvict(fetchedCount)
+
+            for (pdbName, pdbId) in fetchedSymbols:
+                if pdbName not in self.sCache:
+                    self.sCache[pdbName] = {}
+
+                if pdbId in self.sCache[pdbName]:
+                    continue
+
+                newSymbolFile = fetchedSymbols[(pdbName, pdbId)]
+                self.sCache[pdbName][pdbId] = newSymbolFile
+                self.sCacheCount += newSymbolFile.GetEntryCount()
+
+                # Move new symbols to front of MRU list to give them a chance
+                self.UpdateMruList(pdbName, pdbId)
+
+        finally:
+            self.sCacheLock.release()
+
+        LOG.info("Finished prefetching recent symbol files")
+
+    def UpdateMruList(self, pdbName, pdbId):
+        libId = (pdbName, pdbId)
+        if libId in self.sMruSymbols:
+            self.sMruSymbols.remove(libId)
+        self.sMruSymbols.insert(0, libId)
+
+    def MaybeEvict(self, freeEntriesNeeded):
+        maxCacheSize = self.sOptions["maxCacheEntries"]
+        LOG.debug(
+            "Cache occupancy before MaybeEvict: "
+            + str(self.sCacheCount)
+            + "/"
+            + str(maxCacheSize)
+        )
+
+        if (
+            self.sCacheCount == 0
+            or self.sCacheCount + freeEntriesNeeded <= maxCacheSize
+        ):
+            # No need to lock mutex here, this doesn't need to be 100%
+            return
+
+        # If adding the new entries would exceed the max cache size,
+        # evict so that cache is at 70% capacity after new entries added
+        numOldEntriesAfterEvict = max(0, (0.70 * maxCacheSize) - freeEntriesNeeded)
+        numToEvict = self.sCacheCount - numOldEntriesAfterEvict
+
+        # Evict symbols until evict quota is met, starting with least recently
+        # used
+        for (pdbName, pdbId) in reversed(self.sMruSymbols):
+            if numToEvict <= 0:
+                break
+
+            evicteeCount = self.sCache[pdbName][pdbId].GetEntryCount()
+
+            del self.sCache[pdbName][pdbId]
+            self.sCacheCount -= evicteeCount
+            self.sMruSymbols.pop()
+
+            numToEvict -= evicteeCount
+
+        LOG.debug(
+            "Cache occupancy after MaybeEvict: "
+            + str(self.sCacheCount)
+            + "/"
+            + str(maxCacheSize)
+        )
diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolication.py b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolication.py
new file mode 100644
index 0000000000..ecec5c1d9d
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolication.py
@@ -0,0 +1,360 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import hashlib
+import http.client
+import os
+import platform
+import subprocess
+import zipfile
+from distutils import spawn
+
+import six
+from mozlog import get_proxy_logger
+
+from .symbolicationRequest import SymbolicationRequest
+from .symFileManager import SymFileManager
+
+LOG = get_proxy_logger("profiler")
+
+if six.PY2:
+    # Import for Python 2
+    from cStringIO import StringIO as sio
+    from urllib2 import urlopen
+else:
+    # Import for Python 3
+    from io import BytesIO as sio
+    from urllib.request import urlopen
+
+    # Symbolication is broken when using type 'str' in python 2.7, so we use 'basestring'.
+    # But for python 3.0 compatibility, 'basestring' isn't defined, but the 'str' type works.
+    # So we force 'basestring' to 'str'.
+    basestring = str
+
+
+class SymbolError(Exception):
+    pass
+
+
+class OSXSymbolDumper:
+    def __init__(self):
+        self.dump_syms_bin = os.path.join(os.path.dirname(__file__), "dump_syms_mac")
+        if not os.path.exists(self.dump_syms_bin):
+            raise SymbolError("No dump_syms_mac binary in this directory")
+
+    def store_symbols(
+        self, lib_path, expected_breakpad_id, output_filename_without_extension
+    ):
+        """
+        Returns the filename at which the .sym file was created, or None if no
+        symbols were dumped.
+        """
+        output_filename = output_filename_without_extension + ".sym"
+
+        def get_archs(filename):
+            """
+            Find the list of architectures present in a Mach-O file.
+            """
+            return (
+                subprocess.Popen(["lipo", "-info", filename], stdout=subprocess.PIPE)
+                .communicate()[0]
+                .split(b":")[2]
+                .strip()
+                .split()
+            )
+
+        def process_file(arch):
+            proc = subprocess.Popen(
+                [self.dump_syms_bin, "-a", arch, lib_path],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+            stdout, stderr = proc.communicate()
+            if proc.returncode != 0:
+                return None
+
+            module = stdout.splitlines()[0]
+            bits = module.split(b" ", 4)
+            if len(bits) != 5:
+                return None
+            _, platform, cpu_arch, actual_breakpad_id, debug_file = bits
+
+            if str(actual_breakpad_id, "utf-8") != expected_breakpad_id:
+                return None
+
+            with open(output_filename, "wb") as f:
+                f.write(stdout)
+            return output_filename
+
+        for arch in get_archs(lib_path):
+            result = process_file(arch)
+            if result is not None:
+                return result
+        return None
+
+
+class LinuxSymbolDumper:
+    def __init__(self):
+        self.nm = spawn.find_executable("nm")
+        if not self.nm:
+            raise SymbolError("Could not find nm, necessary for symbol dumping")
+
+    def store_symbols(self, lib_path, breakpad_id, output_filename_without_extension):
+        """
+        Returns the filename at which the .sym file was created, or None if no
+        symbols were dumped.
+        """
+        output_filename = output_filename_without_extension + ".nmsym"
+
+        proc = subprocess.Popen(
+            [self.nm, "--demangle", lib_path],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+        )
+        stdout, stderr = proc.communicate()
+
+        if proc.returncode != 0:
+            return
+
+        with open(output_filename, "wb") as f:
+            f.write(stdout)
+
+            # Append nm -D output to the file. On Linux, most system libraries
+            # have no "normal" symbols, but they have "dynamic" symbols, which
+            # nm -D shows.
+            proc = subprocess.Popen(
+                [self.nm, "--demangle", "-D", lib_path],
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+            stdout, stderr = proc.communicate()
+            if proc.returncode == 0:
+                f.write(stdout)
+        return output_filename
+
+
+class ProfileSymbolicator:
+    """This class orchestrates symbolication for a Gecko profile.
+
+    It can be used by multiple pieces of testing infrastructure that generate Gecko
+    performance profiles.
+
+    Args:
+        options (obj): See SymFileManager for details on these options.
+    """
+
+    def __init__(self, options):
+        self.options = options
+        self.sym_file_manager = SymFileManager(self.options)
+        self.symbol_dumper = self.get_symbol_dumper()
+
+    def get_symbol_dumper(self):
+        try:
+            if platform.system() == "Darwin":
+                return OSXSymbolDumper()
+            elif platform.system() == "Linux":
+                return LinuxSymbolDumper()
+        except SymbolError:
+            return None
+
+    def integrate_symbol_zip_from_url(self, symbol_zip_url):
+        if self.have_integrated(symbol_zip_url):
+            return
+        LOG.info(
+            "Retrieving symbol zip from {symbol_zip_url}...".format(
+                symbol_zip_url=symbol_zip_url
+            )
+        )
+        try:
+            io = urlopen(symbol_zip_url, None, 30)
+            with zipfile.ZipFile(sio(io.read())) as zf:
+                self.integrate_symbol_zip(zf)
+            self._create_file_if_not_exists(self._marker_file(symbol_zip_url))
+        except (IOError, http.client.IncompleteRead):
+            LOG.info("Symbol zip request failed.")
+
+    def integrate_symbol_zip_from_file(self, filename):
+        if self.have_integrated(filename):
+            return
+        with open(filename, "rb") as f:
+            with zipfile.ZipFile(f) as zf:
+                self.integrate_symbol_zip(zf)
+        self._create_file_if_not_exists(self._marker_file(filename))
+
+    def _create_file_if_not_exists(self, filename):
+        try:
+            os.makedirs(os.path.dirname(filename))
+        except OSError:
+            pass
+        try:
+            open(filename, "a").close()
+        except IOError:
+            pass
+
+    def integrate_symbol_zip(self, symbol_zip_file):
+        symbol_zip_file.extractall(self.options["symbolPaths"]["FIREFOX"])
+
+    def _marker_file(self, symbol_zip_url):
+        marker_dir = os.path.join(self.options["symbolPaths"]["FIREFOX"], ".markers")
+        return os.path.join(
+            marker_dir, hashlib.sha1(symbol_zip_url.encode("utf-8")).hexdigest()
+        )
+
+    def have_integrated(self, symbol_zip_url):
+        return os.path.isfile(self._marker_file(symbol_zip_url))
+
+    def get_unknown_modules_in_profile(self, profile_json):
+        if "libs" not in profile_json:
+            return []
+        shared_libraries = profile_json["libs"]
+        memoryMap = []
+        for lib in shared_libraries:
+            memoryMap.append([lib["debugName"], lib["breakpadId"]])
+
+        rawRequest = {
+            "stacks": [[]],
+            "memoryMap": memoryMap,
+            "version": 4,
+            "symbolSources": ["FIREFOX", "WINDOWS"],
+        }
+        request = SymbolicationRequest(self.sym_file_manager, rawRequest)
+        if not request.isValidRequest:
+            return []
+        request.Symbolicate(0)  # This sets request.knownModules
+
+        unknown_modules = []
+        for i, lib in enumerate(shared_libraries):
+            if not request.knownModules[i]:
+                unknown_modules.append(lib)
+        return unknown_modules
+
+    def dump_and_integrate_missing_symbols(self, profile_json, symbol_zip_path):
+        if not self.symbol_dumper:
+            return
+
+        unknown_modules = self.get_unknown_modules_in_profile(profile_json)
+        if not unknown_modules:
+            return
+
+        # We integrate the dumped symbols by dumping them directly into our
+        # symbol directory.
+        output_dir = self.options["symbolPaths"]["FIREFOX"]
+
+        # Additionally, we add all dumped symbol files to the missingsymbols
+        # zip file.
+        with zipfile.ZipFile(symbol_zip_path, "a", zipfile.ZIP_DEFLATED) as zf:
+            for lib in unknown_modules:
+                self.dump_and_integrate_symbols_for_lib(lib, output_dir, zf)
+
+    def dump_and_integrate_symbols_for_lib(self, lib, output_dir, zip):
+        name = lib["debugName"]
+        expected_name_without_extension = os.path.join(name, lib["breakpadId"], name)
+        for extension in [".sym", ".nmsym"]:
+            expected_name = expected_name_without_extension + extension
+            if expected_name in zip.namelist():
+                # No need to dump the symbols again if we already have it in
+                # the missingsymbols zip file from a previous run.
+                zip.extract(expected_name, output_dir)
+                return
+
+        lib_path = lib["path"]
+        if not os.path.exists(lib_path):
+            return
+
+        output_filename_without_extension = os.path.join(
+            output_dir, expected_name_without_extension
+        )
+        store_path = os.path.dirname(output_filename_without_extension)
+        if not os.path.exists(store_path):
+            os.makedirs(store_path)
+
+        # Dump the symbols.
+        sym_file = self.symbol_dumper.store_symbols(
+            lib_path, lib["breakpadId"], output_filename_without_extension
+        )
+        if sym_file:
+            rootlen = len(os.path.join(output_dir, "_")) - 1
+            output_filename = sym_file[rootlen:]
+            if output_filename not in zip.namelist():
+                zip.write(sym_file, output_filename)
+
+    def symbolicate_profile(self, profile_json):
+        if "libs" not in profile_json:
+            return
+
+        shared_libraries = profile_json["libs"]
+        addresses = self._find_addresses(profile_json)
+        symbols_to_resolve = self._assign_symbols_to_libraries(
+            addresses, shared_libraries
+        )
+        symbolication_table = self._resolve_symbols(symbols_to_resolve)
+        self._substitute_symbols(profile_json, symbolication_table)
+
+        for process in profile_json["processes"]:
+            self.symbolicate_profile(process)
+
+    def _find_addresses(self, profile_json):
+        addresses = set()
+        for thread in profile_json["threads"]:
+            if isinstance(thread, basestring):
+                continue
+            for s in thread["stringTable"]:
+                if s[0:2] == "0x":
+                    addresses.add(s)
+        return addresses
+
+    def _substitute_symbols(self, profile_json, symbolication_table):
+        for thread in profile_json["threads"]:
+            if isinstance(thread, basestring):
+                continue
+            for i, s in enumerate(thread["stringTable"]):
+                thread["stringTable"][i] = symbolication_table.get(s, s)
+
+    def _get_containing_library(self, address, libs):
+        left = 0
+        right = len(libs) - 1
+        while left <= right:
+            mid = (left + right) // 2
+            if address >= libs[mid]["end"]:
+                left = mid + 1
+            elif address < libs[mid]["start"]:
+                right = mid - 1
+            else:
+                return libs[mid]
+        return None
+
+    def _assign_symbols_to_libraries(self, addresses, shared_libraries):
+        libs_with_symbols = {}
+        for address in addresses:
+            lib = self._get_containing_library(int(address, 0), shared_libraries)
+            if not lib:
+                continue
+            if lib["start"] not in libs_with_symbols:
+                libs_with_symbols[lib["start"]] = {"library": lib, "symbols": set()}
+            libs_with_symbols[lib["start"]]["symbols"].add(address)
+        # pylint: disable=W1656
+        return libs_with_symbols.values()
+
+    def _resolve_symbols(self, symbols_to_resolve):
+        memoryMap = []
+        processedStack = []
+        all_symbols = []
+        for moduleIndex, library_with_symbols in enumerate(symbols_to_resolve):
+            lib = library_with_symbols["library"]
+            symbols = library_with_symbols["symbols"]
+            memoryMap.append([lib["debugName"], lib["breakpadId"]])
+            all_symbols += symbols
+            for symbol in symbols:
+                processedStack.append([moduleIndex, int(symbol, 0) - lib["start"]])
+
+        rawRequest = {
+            "stacks": [processedStack],
+            "memoryMap": memoryMap,
+            "version": 4,
+            "symbolSources": ["FIREFOX", "WINDOWS"],
+        }
+        request = SymbolicationRequest(self.sym_file_manager, rawRequest)
+        if not request.isValidRequest:
+            return {}
+        symbolicated_stack = request.Symbolicate(0)
+        return dict(zip(all_symbols, symbolicated_stack))
diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolicationRequest.py b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolicationRequest.py
new file mode 100644
index 0000000000..bf8e0230d9
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolicationRequest.py
@@ -0,0 +1,317 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import json
+import re
+
+import six
+from mozlog import get_proxy_logger
+
+LOG = get_proxy_logger("profiler")
+
+# Precompiled regex for validating lib names
+# Empty lib name means client couldn't associate frame with any lib
+gLibNameRE = re.compile("[0-9a-zA-Z_+\-\.]*$")
+
+# Maximum number of times a request can be forwarded to a different server
+# for symbolication. Also prevents loops.
+MAX_FORWARDED_REQUESTS = 3
+
+if six.PY2:
+    # Import for Python 2
+    from urllib2 import Request, urlopen
+else:
+    # Import for Python 3
+    from urllib.request import Request, urlopen
+
+    # Symbolication is broken when using type 'str' in python 2.7, so we use 'basestring'.
+    # But for python 3.0 compatibility, 'basestring' isn't defined, but the 'str' type works.
+    # So we force 'basestring' to 'str'.
+    basestring = str
+
+
+class ModuleV3:
+    def __init__(self, libName, breakpadId):
+        self.libName = libName
+        self.breakpadId = breakpadId
+
+
+def getModuleV3(libName, breakpadId):
+    if not isinstance(libName, basestring) or not gLibNameRE.match(libName):
+        LOG.debug("Bad library name: " + str(libName))
+        return None
+
+    if not isinstance(breakpadId, basestring):
+        LOG.debug("Bad breakpad id: " + str(breakpadId))
+        return None
+
+    return ModuleV3(libName, breakpadId)
+
+
+class SymbolicationRequest:
+    def __init__(self, symFileManager, rawRequests):
+        self.Reset()
+        self.symFileManager = symFileManager
+        self.stacks = []
+        self.combinedMemoryMap = []
+        self.knownModules = []
+        self.symbolSources = []
+        self.ParseRequests(rawRequests)
+
+    def Reset(self):
+        self.symFileManager = None
+        self.isValidRequest = False
+        self.combinedMemoryMap = []
+        self.knownModules = []
+        self.stacks = []
+        self.forwardCount = 0
+
+    def ParseRequests(self, rawRequests):
+        self.isValidRequest = False
+
+        try:
+            if not isinstance(rawRequests, dict):
+                LOG.debug("Request is not a dictionary")
+                return
+
+            if "version" not in rawRequests:
+                LOG.debug("Request is missing 'version' field")
+                return
+            version = rawRequests["version"]
+            if version != 4:
+                LOG.debug("Invalid version: %s" % version)
+                return
+
+            if "forwarded" in rawRequests:
+                if not isinstance(rawRequests["forwarded"], (int, int)):
+                    LOG.debug("Invalid 'forwards' field: %s" % rawRequests["forwarded"])
+                    return
+                self.forwardCount = rawRequests["forwarded"]
+
+            # Client specifies which sets of symbols should be used
+            if "symbolSources" in rawRequests:
+                try:
+                    sourceList = [x.upper() for x in rawRequests["symbolSources"]]
+                    for source in sourceList:
+                        if source in self.symFileManager.sOptions["symbolPaths"]:
+                            self.symbolSources.append(source)
+                        else:
+                            LOG.debug("Unrecognized symbol source: " + source)
+                            continue
+                except Exception:
+                    self.symbolSources = []
+                    pass
+
+            if not self.symbolSources:
+                self.symbolSources.append(self.symFileManager.sOptions["defaultApp"])
+                self.symbolSources.append(self.symFileManager.sOptions["defaultOs"])
+
+            if "memoryMap" not in rawRequests:
+                LOG.debug("Request is missing 'memoryMap' field")
+                return
+            memoryMap = rawRequests["memoryMap"]
+            if not isinstance(memoryMap, list):
+                LOG.debug("'memoryMap' field in request is not a list")
+
+            if "stacks" not in rawRequests:
+                LOG.debug("Request is missing 'stacks' field")
+                return
+            stacks = rawRequests["stacks"]
+            if not isinstance(stacks, list):
+                LOG.debug("'stacks' field in request is not a list")
+                return
+
+            # Check memory map is well-formatted
+            cleanMemoryMap = []
+            for module in memoryMap:
+                if not isinstance(module, list):
+                    LOG.debug("Entry in memory map is not a list: " + str(module))
+                    return
+
+                if len(module) != 2:
+                    LOG.debug(
+                        "Entry in memory map is not a 2 item list: " + str(module)
+                    )
+                    return
+                module = getModuleV3(*module)
+
+                if module is None:
+                    return
+
+                cleanMemoryMap.append(module)
+
+            self.combinedMemoryMap = cleanMemoryMap
+            self.knownModules = [False] * len(self.combinedMemoryMap)
+
+            # Check stack is well-formatted
+            for stack in stacks:
+                if not isinstance(stack, list):
+                    LOG.debug("stack is not a list")
+                    return
+                for entry in stack:
+                    if not isinstance(entry, list):
+                        LOG.debug("stack entry is not a list")
+                        return
+                    if len(entry) != 2:
+                        LOG.debug("stack entry doesn't have exactly 2 elements")
+                        return
+
+                self.stacks.append(stack)
+
+        except Exception as e:
+            LOG.debug("Exception while parsing request: " + str(e))
+            return
+
+        self.isValidRequest = True
+
+    def ForwardRequest(self, indexes, stack, modules, symbolicatedStack):
+        LOG.debug("Forwarding " + str(len(stack)) + " PCs for symbolication")
+
+        try:
+            url = self.symFileManager.sOptions["remoteSymbolServer"]
+            rawModules = []
+            moduleToIndex = {}
+            newIndexToOldIndex = {}
+            for moduleIndex, m in modules:
+                l = [m.libName, m.breakpadId]
+                newModuleIndex = len(rawModules)
+                rawModules.append(l)
+                moduleToIndex[m] = newModuleIndex
+                newIndexToOldIndex[newModuleIndex] = moduleIndex
+
+            rawStack = []
+            for entry in stack:
+                moduleIndex = entry[0]
+                offset = entry[1]
+                module = self.combinedMemoryMap[moduleIndex]
+                newIndex = moduleToIndex[module]
+                rawStack.append([newIndex, offset])
+
+            requestVersion = 4
+            while True:
+                requestObj = {
+                    "symbolSources": self.symbolSources,
+                    "stacks": [rawStack],
+                    "memoryMap": rawModules,
+                    "forwarded": self.forwardCount + 1,
+                    "version": requestVersion,
+                }
+                requestJson = json.dumps(requestObj).encode()
+                headers = {"Content-Type": "application/json"}
+                requestHandle = Request(url, requestJson, headers)
+                try:
+                    response = urlopen(requestHandle)
+                except Exception as e:
+                    if requestVersion == 4:
+                        # Try again with version 3
+                        requestVersion = 3
+                        continue
+                    raise e
+                succeededVersion = requestVersion
+                break
+
+        except Exception as e:
+            LOG.error("Exception while forwarding request: " + str(e))
+            return
+
+        try:
+            responseJson = json.loads(response.read())
+        except Exception as e:
+            LOG.error(
+                "Exception while reading server response to forwarded"
+                " request: " + str(e)
+            )
+            return
+
+        try:
+            if succeededVersion == 4:
+                responseKnownModules = responseJson["knownModules"]
+                for newIndex, known in enumerate(responseKnownModules):
+                    if known and newIndex in newIndexToOldIndex:
+                        self.knownModules[newIndexToOldIndex[newIndex]] = True
+
+                responseSymbols = responseJson["symbolicatedStacks"][0]
+            else:
+                responseSymbols = responseJson[0]
+            if len(responseSymbols) != len(stack):
+                LOG.error(
+                    str(len(responseSymbols))
+                    + " symbols in response, "
+                    + str(len(stack))
+                    + " PCs in request!"
+                )
+                return
+
+            for index in range(0, len(stack)):
+                symbol = responseSymbols[index]
+                originalIndex = indexes[index]
+                symbolicatedStack[originalIndex] = symbol
+        except Exception as e:
+            LOG.error(
+                "Exception while parsing server response to forwarded"
+                " request: " + str(e)
+            )
+            return
+
+    def Symbolicate(self, stackNum):
+        # Check if we should forward requests when required sym files don't
+        # exist
+        shouldForwardRequests = False
+        if (
+            self.symFileManager.sOptions["remoteSymbolServer"]
+            and self.forwardCount < MAX_FORWARDED_REQUESTS
+        ):
+            shouldForwardRequests = True
+
+        # Symbolicate each PC
+        pcIndex = -1
+        symbolicatedStack = []
+        missingSymFiles = []
+        unresolvedIndexes = []
+        unresolvedStack = []
+        unresolvedModules = []
+        stack = self.stacks[stackNum]
+
+        for moduleIndex, module in enumerate(self.combinedMemoryMap):
+            if not self.symFileManager.GetLibSymbolMap(
+                module.libName, module.breakpadId, self.symbolSources
+            ):
+                missingSymFiles.append((module.libName, module.breakpadId))
+                if shouldForwardRequests:
+                    unresolvedModules.append((moduleIndex, module))
+            else:
+                self.knownModules[moduleIndex] = True
+
+        for entry in stack:
+            pcIndex += 1
+            moduleIndex = entry[0]
+            offset = entry[1]
+            if moduleIndex == -1:
+                symbolicatedStack.append(hex(offset))
+                continue
+            module = self.combinedMemoryMap[moduleIndex]
+
+            if (module.libName, module.breakpadId) in missingSymFiles:
+                if shouldForwardRequests:
+                    unresolvedIndexes.append(pcIndex)
+                    unresolvedStack.append(entry)
+                symbolicatedStack.append(hex(offset) + " (in " + module.libName + ")")
+                continue
+
+            functionName = None
+            libSymbolMap = self.symFileManager.GetLibSymbolMap(
+                module.libName, module.breakpadId, self.symbolSources
+            )
+            functionName = libSymbolMap.Lookup(offset)
+
+            if functionName is None:
+                functionName = hex(offset)
+            symbolicatedStack.append(functionName + " (in " + module.libName + ")")
+
+        # Ask another server for help symbolicating unresolved addresses
+        if len(unresolvedStack) > 0 or len(unresolvedModules) > 0:
+            self.ForwardRequest(
+                unresolvedIndexes, unresolvedStack, unresolvedModules, symbolicatedStack
+            )
+
+        return symbolicatedStack
diff --git a/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/viewgeckoprofile.py b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/viewgeckoprofile.py
new file mode 100644
index 0000000000..95c73cf503
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/viewgeckoprofile.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import os
+import socket
+import sys
+import webbrowser
+
+import six
+from mozlog import commandline, get_proxy_logger
+from mozlog.commandline import add_logging_group
+
+here = os.path.abspath(os.path.dirname(__file__))
+LOG = get_proxy_logger("profiler")
+
+if six.PY2:
+    # Import for Python 2
+    from urllib import quote
+
+    from SimpleHTTPServer import SimpleHTTPRequestHandler
+    from SocketServer import TCPServer
+else:
+    # Import for Python 3
+    from http.server import SimpleHTTPRequestHandler
+    from socketserver import TCPServer
+    from urllib.parse import quote
+
+
+class ProfileServingHTTPRequestHandler(SimpleHTTPRequestHandler):
+    """Extends the basic SimpleHTTPRequestHandler (which serves a directory
+    of files) to include request headers required by profiler.firefox.com"""
+
+    def end_headers(self):
+        self.send_header("Access-Control-Allow-Origin", "https://profiler.firefox.com")
+        SimpleHTTPRequestHandler.end_headers(self)
+
+
+class ViewGeckoProfile(object):
+    """Container class for ViewGeckoProfile"""
+
+    def __init__(self, gecko_profile_data_path):
+        self.gecko_profile_data_path = gecko_profile_data_path
+        self.gecko_profile_dir = os.path.dirname(gecko_profile_data_path)
+        self.profiler_url = "https://profiler.firefox.com/from-url/"
+        self.httpd = None
+        self.host = "127.0.0.1"
+        self.port = None
+        self.oldcwd = os.getcwd()
+
+    def setup_http_server(self):
+        # pick a free port
+        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        sock.bind(("", 0))
+        self.port = sock.getsockname()[1]
+        sock.close()
+
+        # Temporarily change the directory to the profile directory.
+        os.chdir(self.gecko_profile_dir)
+        self.httpd = TCPServer((self.host, self.port), ProfileServingHTTPRequestHandler)
+
+    def handle_single_request(self):
+        self.httpd.handle_request()
+        # Go back to the old cwd, which some infrastructure may be relying on.
+        os.chdir(self.oldcwd)
+
+    def encode_url(self):
+        # Encode url i.e.: https://profiler.firefox.com/from-url/http...
+        file_url = "http://{}:{}/{}".format(
+            self.host, self.port, os.path.basename(self.gecko_profile_data_path)
+        )
+
+        self.profiler_url = self.profiler_url + quote(file_url, safe="")
+        LOG.info("Temporarily serving the profile from: %s" % file_url)
+
+    def open_profile_in_browser(self):
+        # Open the file in the user's preferred browser.
+        LOG.info("Opening the profile: %s" % self.profiler_url)
+        webbrowser.open_new_tab(self.profiler_url)
+
+
+def create_parser(mach_interface=False):
+    parser = argparse.ArgumentParser()
+    add_arg = parser.add_argument
+
+    add_arg(
+        "-p",
+        "--profile-zip",
+        required=True,
+        dest="profile_zip",
+        help="path to the gecko profiles zip file to open in profiler.firefox.com",
+    )
+
+    add_logging_group(parser)
+    return parser
+
+
+def verify_options(parser, args):
+    ctx = vars(args)
+
+    if not os.path.isfile(args.profile_zip):
+        parser.error("{profile_zip} does not exist!".format(**ctx))
+
+
+def parse_args(argv=None):
+    parser = create_parser()
+    args = parser.parse_args(argv)
+    verify_options(parser, args)
+    return args
+
+
+def view_gecko_profile(profile_path):
+    """
+    Open a gecko profile in the user's default browser. This function opens
+    up a special URL to profiler.firefox.com and serves up the local profile.
+    """
+    view_gecko_profile = ViewGeckoProfile(profile_path)
+
+    view_gecko_profile.setup_http_server()
+    view_gecko_profile.encode_url()
+    view_gecko_profile.open_profile_in_browser()
+    view_gecko_profile.handle_single_request()
+
+
+def start_from_command_line():
+    args = parse_args(sys.argv[1:])
+    commandline.setup_logging("view-gecko-profile", args, {"tbpl": sys.stdout})
+
+    view_gecko_profile(args.profile_zip)
+
+
+if __name__ == "__main__":
+    start_from_command_line()
diff --git a/testing/mozbase/mozgeckoprofiler/setup.py b/testing/mozbase/mozgeckoprofiler/setup.py
new file mode 100644
index 0000000000..0c7949cae9
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/setup.py
@@ -0,0 +1,32 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from setuptools import setup
+
+PACKAGE_NAME = "mozgeckoprofiler"
+PACKAGE_VERSION = "1.0.0"
+
+setup(
+    name=PACKAGE_NAME,
+    version=PACKAGE_VERSION,
+    description="Library to generate and view performance data in the Firefox Profiler",
+    long_description="see https://firefox-source-docs.mozilla.org/mozgeckoprofiler/index.html",
+    classifiers=[
+        "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.5",
+        "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)",
+    ],
+    keywords="mozilla",
+    author="Mozilla Automation and Tools team",
+    author_email="tools@lists.mozilla.org",
+    url="https://wiki.mozilla.org/Auto-tools/Projects/Mozbase",
+    license="MPL",
+    packages=["mozgeckoprofiler"],
+    include_package_data=True,
+    zip_safe=False,
+    install_requires=[],
+    tests_require=[],
+)
diff --git a/testing/mozbase/mozgeckoprofiler/tests/manifest.ini b/testing/mozbase/mozgeckoprofiler/tests/manifest.ini
new file mode 100644
index 0000000000..e3f7083bb0
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/tests/manifest.ini
@@ -0,0 +1,3 @@
+[DEFAULT]
+subsuite = mozbase
+[test_view_gecko_profiler.py]
diff --git a/testing/mozbase/mozgeckoprofiler/tests/test_view_gecko_profiler.py b/testing/mozbase/mozgeckoprofiler/tests/test_view_gecko_profiler.py
new file mode 100644
index 0000000000..c22b16fe18
--- /dev/null
+++ b/testing/mozbase/mozgeckoprofiler/tests/test_view_gecko_profiler.py
@@ -0,0 +1,106 @@
+#!/usr/bin/env python
+
+import io
+import os
+import re
+import shutil
+import tempfile
+import threading
+import time
+import unittest
+from unittest import mock
+
+import mozunit
+import requests
+import six
+from mozgeckoprofiler import view_gecko_profile
+
+if six.PY2:
+    # Import for Python 2
+    from urllib import unquote
+else:
+    # Import for Python 3
+    from urllib.parse import unquote
+
+
+def access_profiler_link(file_url, response):
+    """Attempts to access the profile in a loop for 5 seconds.
+
+    This is run from a separate thread.
+    """
+    timeout = 5  # seconds
+    start = time.time()
+
+    while time.time() - start < timeout:
+        # Poll the server to try and get a response.
+        result = requests.get(url=file_url)
+        if result.ok:
+            # Return the text back in a list.
+            response[0] = result.text
+            return
+        time.sleep(0.1)
+
+    response[0] = "Accessing the profiler link timed out after %s seconds" % timeout
+
+
+class TestViewGeckoProfile(unittest.TestCase):
+    """Tests the opening local profiles in the Firefox Profiler."""
+
+    def setUp(self):
+        self.firefox_profiler_url = None
+        self.thread = None
+        self.response = [None]
+
+    def test_view_gecko_profile(self):
+
+        # Create a temporary fake performance profile.
+        temp_dir = tempfile.mkdtemp()
+        profile_path = os.path.join(temp_dir, "fakeprofile.json")
+        with io.open(profile_path, "w") as f:
+            f.write(u"FAKE_PROFILE")
+
+        # Mock the open_new_tab function so that we know when the view_gecko_profile
+        # function has done all of its work, and we can assert ressult of the
+        # user behavior.
+        def mocked_open_new_tab(firefox_profiler_url):
+            self.firefox_profiler_url = firefox_profiler_url
+            encoded_file_url = firefox_profiler_url.split("/")[-1]
+            decoded_file_url = unquote(encoded_file_url)
+            # Extract the actual file from the path.
+            self.thread = threading.Thread(
+                target=access_profiler_link, args=(decoded_file_url, self.response)
+            )
+            print("firefox_profiler_url %s" % firefox_profiler_url)
+            print("encoded_file_url %s" % encoded_file_url)
+            print("decoded_file_url %s" % decoded_file_url)
+            self.thread.start()
+
+        with mock.patch("webbrowser.open_new_tab", new=mocked_open_new_tab):
+            # Run the test
+            view_gecko_profile(profile_path)
+
+        self.thread.join()
+
+        # Compare the URLs, but replace the PORT value supplied, as that is dynamic.
+        expected_url = (
+            "https://profiler.firefox.com/from-url/"
+            "http%3A%2F%2F127.0.0.1%3A{PORT}%2Ffakeprofile.json"
+        )
+        actual_url = re.sub("%3A\d+%2F", "%3A{PORT}%2F", self.firefox_profiler_url)
+
+        self.assertEqual(
+            actual_url,
+            expected_url,
+            "The URL generated was correct for the Firefox Profiler.",
+        )
+        self.assertEqual(
+            self.response[0],
+            "FAKE_PROFILE",
+            "The response from the serve provided the profile contents.",
+        )
+
+        shutil.rmtree(temp_dir)
+
+
+if __name__ == "__main__":
+    mozunit.main()